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初一因式分解练习题及答案
2021-04-12 01:10爱问
简介1 初一因式分解练习题及答案 你可真狠 要这么多题目 1. 5ax+5bx+3ay+3by 解法:=5x(a+b)+3y(a+b) =(5x+3y)(a+b) 2. x^3-x^2+x-1 解法:=(x^3-x^2)+(x-1) =x^2(x-1)+ (x-1) =(x-1)(x^2+1) 3. x2-x-y2-y 解法:=(x2-y2)-(x+y) =(x+y)(x-y)-(x+y) =(x+y)(x-y-1)...
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初一因式分解练习题及答案
你可真狠 要这么多题目1. 5ax+5bx+3ay+3by 解法:=5x(a+b)+3y(a+b) =(5x+3y)(a+b) 2. x^3-x^2+x-1 解法:=(x^3-x^2)+(x-1) =x^2(x-1)+ (x-1) =(x-1)(x^2+1) 3. x2-x-y2-y 解法:=(x2-y2)-(x+y) =(x+y)(x-y)-(x+y) =(x+y)(x-y-1)bc(b+c)+ca(c-a)-ab(a+b) =bc(c-a+a+b)+ca(c-a)-ab(a+b) =bc(c-a)+bc(a+b)+ca(c-a)-ab(a+b) =bc(c-a)+ca(c-a)+bc(a+b)-ab(a+b) =(bc+ca)(c-a)+(bc-ab)(a+b) =c(c-a)(b+a)+b(a+b)(c-a) =(c+b)(c-a)(a+b).x^2+3x-40 =x^2+3x+2.25-42.25 =(x+1.5)^2-(6.5)^2 =(x+8)(x-5).(x^2+x+1)(x^2+x+2)-12时,可以令y=x^2+x,则 原式=(y+1)(y+2)-12 =y^2+3y+2-12=y^2+3y-10 =(y+5)(y-2) =(x^2+x+5)(x^2+x-2) =(x^2+x+5)(x+2)(x-1).(1+y)^2-2x^2(1+y^2)+x^4(1-y)^2 解:原式=(1+y)^2+2(1+y)x^2(1+y)+x^4(1-y)^2-2(1+y)x^2(1-y)-2x^2(1+y^2) =[(1+y)+x^2(1-y)]^2-2(1+y)x^2(1-y)-2x^2(1+y^2) =[(1+y)+x^2(1-y)]^2-(2x)^2 =[(1+y)+x^2(1-y)+2x]·[(1+y)+x^2(1-y)-2x] =(x^2-x^2y+2x+y+1)(x^2-x^2y-2x+y+1) =[(x+1)^2-y(x^2-1)][(x-1)^2-y(x^2-1)] =(x+1)(x+1-xy+y)(x-1)(x-1-xy-y) x^5+3x^4y-5x^3y^2+4xy^4+12y^5 解:原式=(x^5+3x^4y)-(5x^3y^2+15x^2y^3)+(4xy^4+12y^5) =x^4(x+3y)-5x^2y^2(x+3y)+4y^4(x+3y) =(x+3y)(x^4-5x^2y^2+4y^4) =(x+3y)(x^2-4y^2)(x^2-y^2) =(x+3y)(x+y)(x-y)(x+2y)(x-2y) 分解因式m +5n-mn-5m 解:m +5n-mn-5m= m -5m -mn+5n = (m -5m )+(-mn+5n) =m(m-5)-n(m-5) =(m-5)(m-n) 分解因式bc(b+c)+ca(c-a)-ab(a+b) 解:bc(b+c)+ca(c-a)-ab(a+b)=bc(c-a+a+b)+ca(c-a)-ab(a+b) =bc(c-a)+ca(c-a)+bc(a+b)-ab(a+b) =c(c-a)(b+a)+b(a+b)(c-a) =(c+b)(c-a)(a+b) 1.(2a-b)²+8ab2.y²-2y-x²+13.x²-xy+yz-xz4.6x²+5x-45.2a²-7ab+6b²6.(x²-2x)²+2(x²-2x)+17.(x²-2x)²-14(x²-2x)-15 8.x²(x-y)+(y-x)9.169(a+b)²-121(a-b)²10.(x-3)(x-5)+1 答案:1.(2a-b)²+8ab=(2a+b)²2.y²-2y-x²+1=(y-1)²-x²=(y-1-x)(y-1+x)3.x²-xy+yz-xz =x(x-y)-z(x-y)=(x-z)(x-y)4.6x²+5x-4 =(2x-1)(3x+4)5.2a²-7ab+6b²=(2a-3b)(a-2b)6.(x²-2x)²+2(x²-2x)+1 =(x²-2x+1)²=(x-1)^47.(x²-2x)²-14(x²-2x)-15 =(x²-2x-15)(x²-2x+1)=(x+3)(x-5)(x-1)² 8.x²(x-y)+(y-x) =(x²-1)(x-y)=(x+1)(x-1)(x-y)9.169(a+b)²-121(a-b)² =(14a+14b-11a+11b)(14a+14b+11a-11b) =(3a+25b)(25a+3b)10.(x-3)(x-5)+1 =(x-3)²-2(x-3)+1 =(x-3-1)²=(x-4)² -5a^2+16a=a(16-5a)8x^2-4x=4x(2x-1)15p+10p^2=5p(3+2p)-3x^2y-6xy=-3xy(x+2y)14m^3n^2-6m^2n^3=2m^2n^2(7m-6n)27a^2 b^3 c+18ab^2=9ab^2(3abc+2)18xy^2 z^3+12x^2 y^2=6xy^2(3z^3+2x)8m^2 n^2 -6m^3 n^2=2m^2 n^2(4-3m)因式分解3a3b2c-6a2b2c2+9ab2c3=3ab^2 c(a^2-2ac+3c^2) 3.因式分解xy+6-2x-3y=(x-3)(y-2) 4.因式分解x2(x-y)+y2(y-x)=(x+y)(x-y)^2 5.因式分解2x2-(a-2b)x-ab=(2x-a)(x+b) 6.因式分解a4-9a2b2=a^2(a+3b)(a-3b) 7.若已知x3+3x2-4含有x-1的因式,试分解x3+3x2-4=(x-1)(x+2)^2 8.因式分解ab(x2-y2)+xy(a2-b2)=(ay+bx)(ax-by) 9.因式分解(x+y)(a-b-c)+(x-y)(b+c-a)=2y(a-b-c) 10.因式分解a2-a-b2-b=(a+b)(a-b-1) 11.因式分解(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3a-b-2(a+3b)]^2=(a-7b)^2 12.因式分解(a+3)2-6(a+3)=(a+3)(a-3) 13.因式分解(x+1)2(x+2)-(x+1)(x+2)2=-(x+1)(x+2) abc+ab-4a=a(bc+b-4) (2)16x2-81=(4x+9)(4x-9) (3)9x2-30x+25=(3x-5)^2 (4)x2-7x-30=(x-10)(x+3) 35.因式分解x2-25=(x+5)(x-5) 36.因式分解x2-20x+100=(x-10)^2 37.因式分解x2+4x+3=(x+1)(x+3) 38.因式分解4x2-12x+5=(2x-1)(2x-5) 39.因式分解下列各式: (1)3ax2-6ax=3ax(x-2) (2)x(x+2)-x=x(x+1) (3)x2-4x-ax+4a=(x-4)(x-a) (4)25x2-49=(5x-9)(5x+9) (5)36x2-60x+25=(6x-5)^2 (6)4x2+12x+9=(2x+3)^2 (7)x2-9x+18=(x-3)(x-6) (8)2x2-5x-3=(x-3)(2x+1) (9)12x2-50x+8=2(6x-1)(x-4) 40.因式分解(x+2)(x-3)+(x+2)(x+4)=(x+2)(2x-1) 41.因式分解2ax2-3x+2ax-3= (x+1)(2ax-3) 42.因式分解9x2-66x+121=(3x-11)^2 43.因式分解8-2x2=2(2+x)(2-x) 44.因式分解x2-x+14 =整数内无法分解 45.因式分解9x2-30x+25=(3x-5)^2 46.因式分解-20x2+9x+20=(-4x+5)(5x+4) 47.因式分解12x2-29x+15=(4x-3)(3x-5) 48.因式分解36x2+39x+9=3(3x+1)(4x+3) 49.因式分解21x2-31x-22=(21x+11)(x-2) 50.因式分解9x4-35x2-4=(9x^2+1)(x+2)(x-2) 51.因式分解(2x+1)(x+1)+(2x+1)(x-3)=2(x-1)(2x+1) 52.因式分解2ax2-3x+2ax-3=(x+1)(2ax-3) 53.因式分解x(y+2)-x-y-1=(x-1)(y+1) 54.因式分解(x2-3x)+(x-3)2=(x-3)(2x-3) 55.因式分解9x2-66x+121=(3x-11)^2 56.因式分解8-2x2=2(2-x)(2+x) 57.因式分解x4-1=(x-1)(x+1)(x^2+1) 58.因式分解x2+4x-xy-2y+4=(x+2)(x-y+2) 59.因式分解4x2-12x+5=(2x-1)(2x-5) 60.因式分解21x2-31x-22=(21x+11)(x-2) 61.因式分解4x2+4xy+y2-4x-2y-3=(2x+y-3)(2x+y+1) 62.因式分解9x5-35x3-4x=x(9x^2+1)(x+2)(x-2)
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初一因式分解练习题+复杂的
这里有很多任意下载,Word版,很不错的百度文库。http://wenku.baidu.com/search?word=%D2%F2%CA%BD%B7%D6%BD%E2&lm=0&od=0
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初一因式分解练习题300道
(1)a的四次方+a²+1=a^4+2a²+1-a²=(a²+1)²-a²=(a²+a+1)(a²-a+1)(2)2a²-7ab+6b² =(2a-3b)(a-2b)(3)3x²+xy-2y² =(3x-2y)(x+y)(4)10a²b²+11ab-6 =(2ab+3)(5ab-2)(5)7a³x-28a(x的五次方)=7a³(x-4a²)(6)x³-10x²+16x=x(x²-10x+16)=x(x-2)(x-8)(7)(x²+3x)²-2(x²+3x)-8=(x²+3x+2)(x²+3x-4)=(x+1)(x+2)(x+4)(x-1)(8)(x-y)²+4xy-1 =x²-2xy+y²+4xy-1=x²+2xy+y²-1=(x+y)²-1=(x+y+1)(x+y-1)9.x^2 -4xy +4y^2 -x +2y -2= (x-2y)^2 - (x-2y) -2=(x-2y + 1)(x-2y-2)10.x³+ax²+bx²+cx²+abx+bcx+acx+ab=x³+cx²+abx+abc+bx²+bcx+ax²+acx=x²(x+c)+ab(x+c)+bx(x+c)+ax(x+c)=(x+c)[x²+bx+ab+ax]=(x+c)[x(x+b)+a(x+b)]=(x+a)(x+b)(x+c)11.x²-y²-y-1/2=x²-(y²+y+1/4)=x²-(y+1/2)²=(x+y+1/2)(x-y-1/2)12.x的四次方+3x³+6x ² -4=x^4+x³+2x³+2x²+4(x²-1)=x³(x+1)+2x²(x+1)+(4x-4)(x+1)=(x+1)(x³+2x²+4x-4)13.x³-3x²+4=x³+1-3(x²-1)=(x+1)(x²-x+1)-(3x-3)(x+1)=(x+1)(x²-4x+4)=(x+1)(x-2)²14.32a[(x^2+2x)^2]-2a =2a[16(x^2+2x)^2-1] =2a(4x^2+8x+1)(4x^2+8x-1) 15.16+8(x^2+4x)+(x^2+4x)^2 =(4+x^2+4x)^2 =(x^2+4x+4)^2 =(x+2)^4 16.3x^ny+9x^(n-1)y^2+x^(n+1)/4 =x^(n-1)(3xy+9y^2+x^2/4) =x^(n-1)(x^2/4+3xy+9y^2) =x^(n-1)(x/2+3y)^2 =(1/4)[x^(n-1)](x+6y)^217.a^4+a³+3a-5=a²*(a²+a)+3a-5 =3a²+3a-5 =3(a²+a)-518.1+x+x(x+1)+x(x+1)^2+x(x+1)^3 =(1+x)+x(x+1)+x(x+1)^2+x(x+1)^3 =(1+x)(1+x)+x(x+1)^2+x(x+1)^3 =(1+x)²(1+x)+x(x+1)^3 =(1+x)³(1+x)=(1+x)^419. (x-y)(2x-2y-3)-2 =(x-y)[2(x-y)-3]-2 =2(x-y) ^2-3(x-y)-2 =[(x-y)-2][2(x-y)+1] =(x-y-2)(2x-2y+1). x2-3xy-10y2+x+9y-2=(x-5y+2)(x+2y-1). x2-y2+5x+3y+4=(x+y+1)(x-y+4). xy+y2+x-y-2=(y+1)(x+y-2). 6x2-7xy-3y2-xz+7yz-2z2=(2x-3y+z)(3x+y-2z). a^2+2b^2+3c^2+3aB+4ac+5bc =(a+b+c)(a+2b+3c)x^2-8x+7 =(x-1)(x-7)X^2+8X+7= (x+1)(x+7)X^2-10X-11 =(x-11)(x+1)x^2+10X-11= ,(x+11)(x-1)X^+3x-18 =(x+6)(x-3)x^2+11X+18 =(x+2)(x+9) x^2-11x+18 =(x-2)(x-9) x^2+17X-18 =(x+18)(x-1)X^2-17X-18 =( x-18)(x+1) xy+6-2x-3y=(x-3)(y-2)x2(x-y)+y2(y-x)=(x+y)(x-y)^2 2x2-(a-2b)x-ab=(2x-a)(x+b) a4-9a2b2=a^2(a+3b)(a-3b) x3+3x2-4=(x-1)(x+2)^2 ab(x2-y2)+xy(a2-b2)=(ay+bx)(ax-by) (x+y)(a-b-c)+(x-y)(b+c-a)=2y(a-b-c) a2-a-b2-b=(a+b)(a-b-1) (3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3a-b-2(a+3b)]^2=(a-7b)^2 (x+1)2(x+2)-(x+1)(x+2)2=-(x+1)(x+2)abc+ab-4a=a(bc+b-4) 16x2-81=(4x+9)(4x-9) 9x2-30x+25=(3x-5)^2 x2-7x-30=(x-10)(x+3) x2-25=(x+5)(x-5) x2+4x+3=(x+1)(x+3)4x2-12x+5=(2x-1)(2x-5)3ax2-6ax=3ax(x-2) x(x+2)-x=x(x+1) x2-4x-ax+4a=(x-4)(x-a) 25x2-49=(5x-9)(5x+9) 36x2-60x+25=(6x-5)^2 4x2+12x+9=(2x+3)^2 x2-9x+18=(x-3)(x-6) 2x2-5x-3=(x-3)(2x+1) 12x2-50x+8=2(6x-1)(x-4) (x+2)(x-3)+(x+2)(x+4)=(x+2)(2x-1) 2ax2-3x+2ax-3= (x+1)(2ax-3)9x2-66x+121=(3x-11)^2 8-2x2=2(2+x)(2-x) 9x2-30x+25=(3x-5)^2 -20x2+9x+20=(-4x+5)(5x+4) 12x2-29x+15=(4x-3)(3x-5) 36x2+39x+9=3(3x+1)(4x+3) 21x2-31x-22=(21x+11)(x-2) 9x4-35x2-4=(9x^2+1)(x+2)(x-2) (2x+1)(x+1)+(2x+1)(x-3)=2(x-1)(2x+1) 2ax2-3x+2ax-3=(x+1)(2ax-3) x(y+2)-x-y-1=(x-1)(y+1) (x2-3x)+(x-3)2=(x-3)(2x-3) 9x2-66x+121=(3x-11)^2 8-2x2=2(2-x)(2+x) x4-1=(x-1)(x+1)(x^2+1) x2+4x-xy-2y+4=(x+2)(x-y+2) 4x2-12x+5=(2x-1)(2x-5) 21x2-31x-22=(21x+11)(x-2) 4x2+4xy+y2-4x-2y-3=(2x+y-3)(2x+y+1) 9x5-35x3-4x=x(9x^2+1)(x+2)(x-2) 3x2-6x=3x(x-2) 49x2-25=(7x+5)(7x-5) 6x2-13x+5=(2x-1)(3x-5) x2+2-3x=(x-1)(x-2) 12x2-23x-24=(3x-8)(4x+3) (x+6)(x-6)-(x-6)=(x-6)(x+5) 3(x+2)(x-5)-(x+2)(x-3)=2(x-6)(x+2) 9x2+42x+49=(3x+7)^2 。 3a3b2c-6a2b2c2+9ab2c3=3ab^2 c(a^2-2ac+3c^2) xy+6-2x-3y=(x-3)(y-2) x2(x-y)+y2(y-x)=(x+y)(x-y)^2 2x2-(a-2b)x-ab=(2x-a)(x+b) x^3+2x^2-16x-32=(x+2)(x+4)(x-4)(a-b)a^6+(b-a)b^6=(a-b)^2(a^2+ab+b^2)(a+b)(a^2-ab+b^2)(x+y)(x+y+2xy)+(xy+1)(xy-1) =(x+1)(y+1)(x+y+xy-1) X^8+X^7+1 =(X^2+X+1)(X^6-X^4+X^3-X+1) x^8+x^6+x^4+x^2+1 =(x^4+x^3-x+1)(x^4+x^3+x^2+x+1) x^2-20x+100=(x-10)^2x^2-3x+2=(x-1)(x-2)x^2-2x-15=(x+3)(x-5)x^2+2x-15=(x-3)(x+5)x^2-7x+12=(x-3)(x-4)x^2-7x-30=(x+3)(x-10)x^2+2x-3=(x-1)(x+3)x^2-16x+64=(x-8)^2x^2-9x+20=(x-4)(x-5)x^2-6x+8=(x-2)(x-4)x^2-6x-7=(x-7)(x+1)要给分啊
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免费初二因式分解练习题和答案
现出的:1.ax+by+ay+bx2.x^3+13.x^2+x^34.x^2+x^3-25.x^2-6x+86.x^2-12x+357.(x^3-1)+(x-1)(6x+11)8.x^4-19.x^4+410.b^2+ab+ac+bc11.x^3+y^3+z^3-3xyz12.x^6+8x^3+913.x^2-100x+9914.x^2-x-y^2-y15.7x^2-19x-616.8x^2-6x-917.x+1)(x+2)-1218.x^2+(p+q)x+pq19.3x^3-6x^2+320.a^2(x-2a)^2-a(x-2a)^221.25m^2-10mn+n^222.x^2-3x-2823.y^4+2y^3-3y^224.(x-1)^2*(3x-2)+(2-3x)25.(x-2)^2-x+226.x^2-12x-2827.12a^2*b(x-y)-4ab(y-x)28.a^2+5a+629.x^11-2x^10+x^930.x^2+x31.x^3+x32.x^4+x33.100x^2+30xy+2y^234.6y^2-16y+835.6-7a-5a^236.3x^2-17x+1037.6a^2-11ab+3b^238.2m^3+3m^2-5m39.(x+y)^2-2(x+y)-340.a^2-b^2+2ab-c^241.m^2+2mn+n^2-142.x^2-4y^2+4yz-z^243.9x^2-4y^2-z^2+4yz44.-25+a^2+9b^2-6ab45.2x^2-100x-10246.x^2*y^2-7xy+1047.x^2-x-248.-x^2*y+6xy-8y49.x^2-9y^2-x+3y50.x^2-7x-8出不动了。。。难度不随题号变化,解题方法不随题号变化,老少皆宜,童叟无欺。答案:1.(a+b)(x+y)2.(x+1)(x^2-x+1)3.x^2*(x+1)4.(x-1)(x^2-2x+2)5.(x-2)(x-4)6.(x-5)(x-7)7.(x-1)(x+3)(x+4)8.(x^2+1)(x-1)(x+1)9.(x^2-2x+2)(x^2+2x+x)10.(b+c)(b+a)11.(x+y+z)(x^2+y^2+z^2-xy-yz-xz)12.(x+1)(x^2-x+1)(x+2)(x^2-2x+4)13.(x-99)(x-1)14.(x+y)(x-y-1)15.(7x+2)(x-3)16.(2x-3)(4x+3)17.(x+5)(x-2)18.(x+p)(x+q)19.(x-1)(x^2-x-1)20.a(a-1)(x-2a)^221.(5m-n)^222.(x-7)(x+4)23.y^2(y-1)(y+3)24.x(x-2)(3x-2)25.(x-2)(x-3)26.(x-14)(x+2)27.4ab(3a+1)(x-y)28.(a+2)(a+3)29.x^9*(x-1)^230.x(1+x)31.x(1+x^2)32.x(1+x)(1-x+x^2)33.2(5x+y)(10x+y)34.2(3y-2)(y-2)35.(3-5a)(a+2)36.(3x-2)(x-5)37.(2a-3b)(3a-b)38.m(m-1)(2m+5)39.(x+y-3)(x+y+1)40.(a+b-c)(a+b+c)41.(m+n+1)(m+n-1)42.(x+2y-z)(x-2y+z)43.(3x+2y-z)(3x-2y+z)44.(a-3b-5)(a-3b+5)45.2(x-51)(x+1)46.(xy-5)(xy-2)47.(x-2)(x+1)48.-y(x-2)(x-4)49.(x-y)(x+3y-1)50.(x-8)(x+1)
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因式分解练习题及答案,求!!!
140.m2(p-q)-p+q141.(2m+3n)(2m-n)-4n(2m-n).142.(x+2y)2-x2-2xy.143.a(ab+bc+ac)-abc.144.ab-a-b+1.145.xyz-xy-xz+x-yz+y+z-1.146.x4-2y4-2x3y+xy3.148.abc(a2+b2+c2)-a3bc+2ab2c2.149.(a-b-c)(a+b-c)-(b-c-a)(b+c-a).150.a2(b-c)+b2(c-a)+c2(a-b).a(a+b)(a-b)-a(a+b)2.152.(x2-2x)2+2x(x-2)+1.153.2acd-c2a-ad2.154.(x-y)2+12(y-x)z+36z2.156.x2-4ax+8ab-4b2.157.a2b2+c2d2-2abcd+2ab-2cd+1.158.(ax+by)2+(ay-bx)2+2(ax+by)(ay-bx).160.(1-a2)(1-b2)-(a2-1)2(b2-1)2.161.3x4-48y4.162.(x+1)2-9(x-1)2.163.(x2+pq)2-(p+q)2x2.164.(1+2xy)2-(x2+y2)2.165.4a2b2-(a2+b2)2.166.4a2b2-(a2+b2-c2)2.167.(c2-a2-b2)2-4a2b2.168.(x2-b2+y2-a2)2-4(ab-xy)2.169.64a4(x+1)2-49b4(x+1)4.170.ab2-ac2+4ac-4a.171.4a2-c2+6ab+3bc.172.x3n+y3n.174.(x+y)3+125.176.(m-n)6-(m+n)6.177.(x+1)6-(x-1)6.178.a12-b12.179.(z-x)3-(y+z)3.180.(3m-2n)3+(3m+2n)3.181.x6(x2-y2)+y6(y2-x2).182.8(x+y)3+1.183.(a-1)3-(b+1)3.184.(a+b+c)3-a3-b3-c3.185.x2+4xy+3y2.186.x2y2-18xy+65.187.x2+18x-144.188.x2+30x+144.189.x4+2x2-8.190.3x4+6x2-9.191.-m4+18m2-17.192.3x4-7x2y2-20y4.193.x5-2x3-8x.194.a3-5a2b-300ab2.195.x8+19x5-216x2.196.6a4n+k-a2n+k-35ak.199.30x2+8xy-182y2.200.m4+14m2-15.140.(p-q)(m-1)(m+1).141.(2m-n)2.142.2y(x+2y).143.a2(b+c).144.(b-1)(a-1).145.(x-1)(y-1)(z-1).提示:方法一 原式=x(yz-y-z+1)-(yz-y-z+1)=(yz-y-z+1)(x-1)=[y(z-1)-(z-1)](x-1)=(x-1)(y-1)(z-1).方法二 原式=xy(z-1)-x(z-1)-y(z-1)+(z-1)=(xy-x-y+1)(z-1)=[x(y-1)-(y-1)](z-1)=(x-1)(y-1)(z-1).146.(x-2y)(x+y)(x2-xy+y2).提示:方法一 原式=x(x3+y3)-2y(x3+y3)=(x3+y3)(x-2y)=(x-2y)(x+y)(x2-xy+y2).方法二 原式=x3(x-2y)+y3(x-2y)=(x-2y)(x3+y3)=(x-2y)(x+y)(x2-xy+y2).148.abc(b+c)2.提示:原式=abc(a2+b2+c2-a2+2bc).149.2(b-c)(a-b-c).提示:原式=(a-b-c)(a+b-c)+(a-b-c)(b-c-a)=(a-b-c)[(a+b-c)+(b-c-a)]=2(b-c)(a-b-c).150.(a-b)(b-c)(a-c).提示:原式=a2b-a2c+b2c-ab2+c2(a-b)=(a2b-ab2)-(a2c-b2c)+c2(a-b)=ab(a-b)-c(a2-b2)+c2(a-b)=(a-b)[ab-c(a+b)+c2]=(a-b)[a(b-c)-c(b-c)]=(a-b)(b-c)(a-c).提示:原式=a(a+b)[a-b-(a+b)]=a(a+b)(-2b)=-2ab(a+b);152.(x-1)4.提示:原式=[x(x-2)]2+2•x(x-2)+12=[x(x-2)+1]2=(x2-2x+1)2=(x-1)4.153.-a(c-d)2.154.(x-y-6z)2.156.(x-2b)(x-4a+2b).157.(ab-cd+1)2.提示:原式=(a2b2-2abcd+c2d2)+2(ab-cd)+1=(ab-cd)2+2(ab-cd)+1=(ab-cd+1)2.158.(ax+by+ay-bx)2.160.(1+a)(1-a)(1+b)(1-b)(a2+b2-a2b2).161.3(x2+4y2)(x+2y)(x-2y).162.4(2x-1)(2-x).163.(x2+px+qx+pq)(x2-px-qx+pq).164.(1+x-y)(1-x+y)(x2+y2+2xy+1).165.-(a+b)2(a-b)2.166.(a+b+c)(a+b-c)(c+a-b)(c-a+b).提示:原式=(2ab+a2+b2-c2)(2ab-a2-b2+c2)=[(a+b)2-c2][c2-(a-b)2]=(a+b+c)(a+b-c)(c+a-b)(c-a+b).167.(c+a-b)(c-a+b)(c+a+b)(c-a-b).168.(x+y+a+b)(x+y-a-b)(x-y+a-b)(x-y-a+b).提示:原式=(x2-b2+y2-a2+2ab-2xy)(x2-b2+y2-a2-2ab+2xy)=[(x2-2xy+y2)-(a2-2ab+b2)][(x2+2xy+y2)-(a2+2ab+b2)]=[(x-y)2-(a-b)2][(x+y)2-(a+b)2]=(x-y+a-b)(x-y-a+b)(x+y+a+b)(x+y-a-b).169.(x+1)2(8a2+7b2x+7b2)(8a2-7b2x-7b2).170.a(b-c+2)(b+c-2).提示:原式=a(b2-c2+4c-4)=a(b2-c2+2b-2b+2c+2c-4)=a[(b-c)(b+c)-2(b-c)+2(b+c)-4]=a[(b-c)+2][(b+c)-2].171.(2a+c)(2a-c+3b).172.(xn+yn)(x2n-xnyn+y2n).174.(x+y+5)(x2+2xy+y2-5x-5y+25).176.-4mn(3n2+m2)(3m2+n2).提示:原式=[(m-n)3]2-[(m+n)3]2=[(m-n)3+(m+n)3][(m-n)3-(m+n)3]=2m[(m-n)2-(m-n)(m+n)(m+n)2]×{-2n[(m-n)2+(m-n)(m+n)+(m+n)2]}=-4mn(m2+3n2)(3m2+n2).177.4x(x2+3)(3x2+1).提示:原式=[(x+1)3]2-[(x-1)3]2=[(x+1)3+(x-1)3][(x+1)3-(x-1)3]=2x[(x+1)2-(x+1)(x-1)+(x-1)2]×2[(x+1)2+(x+1)(x-1)+(x-1)2]=4x(x2+3)(3x2+1).178.(a-b)(a+b)(a2+b2)(a2+ab+b2)(a2-ab+b2)(a4-a2b2+b4).提示:原式=(a6)2-(b6)2=(a6+b6)(a6-b6)=[(a2)3+(b2)3][(a3)2-(b3)2]=(a2+b2)(a4-a2b2+b4)(a3+b3)(a3-b3).179.-(x+y)(x2+y2+3z2-xy+3yz-3xz).180.18m(3m2+4n2).181.(x+y)2(x-y)2(x2-xy+y2)(x2+xy+y2).提示:原式=(x2-y2)(x6-y6)=(x+y)(x-y)(x3+y3)(x3-y3).182.(2x+2y+1)(4x2+8xy+4y2-2x-2y+1).183.(a-b-2)(a2+ab+b2-a+b+1).184.3(b+c)(a+b)(c+a).提示:原式=[(a+b+c)3-a3]-(b3+c3).185.(x+3y)(x+y).186.(xy-13)(xy-5).187.(x-6)(x+24).188.(x+6)(x+24).189.(x2-2)(x2+4).190.3(x2+3)(x+1)(x-1).191.(m2-17)(1+m)(1-m).192.(3x2+5y2)(x+2y)(x-2y).193.x(x+2)(x-2)(x2+2).194.a(a-20b)(a+15b).195.x2(x+3)(x2-3x+9)(x-2)(x2+2x+4).提示:原式=x2(x6+19x3-216)=x2(x3+27)(x3-8)=x3(x+3)(x2-3x+9)(x-2)(x2+2x+4).196.ak(2a2n-5)(3a2n+7).199.2(3x-7y)(5x+13y).200.(m2+15)(m+1)(m-1).201.m2(p-q)-p+q;202.a(ab+bc+ac)-abc;203.x4-2y4-2x3y+xy3;204.abc(a2+b2+c2)-a3bc+2ab2c2;205.a2(b-c)+b2(c-a)+c2(a-b);206.(x2-2x)2+2x(x-2)+1;207.(x-y)2+12(y-x)z+36z2;208.x2-4ax+8ab-4b2;209.(ax+by)2+(ay-bx)2+2(ax+by)(ay-bx);210.(1-a2)(1-b2)-(a2-1)2(b2-1)2;211.(x+1)2-9(x-1)2;212.4a2b2-(a2+b2-c2)2;213.ab2-ac2+4ac-4a;214.x3n+y3n;215.(x+y)3+125;216.(3m-2n)3+(3m+2n)3;217.x6(x2-y2)+y6(y2-x2);218.8(x+y)3+1;219.(a+b+c)3-a3-b3-c3;220.x2+4xy+3y2;221.x2+18x-144;222.x4+2x2-8;223.-m4+18m2-17;224.x5-2x3-8x;225.x8+19x5-216x2;226.(x2-7x)2+10(x2-7x)-24;227.5+7(a+1)-6(a+1)2;228.(x2+x)(x2+x-1)-2;229.x2+y2-x2y2-4xy-1;230.(x-1)(x-2)(x-3)(x-4)-48;231.x2-y2-x-y;232.ax2-bx2-bx+ax-3a+3b;233.m4+m2+1;234.a2-b2+2ac+c2;235.a3-ab2+a-b;236.625b4-(a-b)4;237.x6-y6+3x2y4-3x4y2;238.x2+4xy+4y2-2x-4y-35;239.m2-a2+4ab-4b2;240.5m-5n-m2+2mn-n2.参考答案:三、因式分解:1.(p-q)(m-1)(m+1).8.(x-2b)(x-4a+2b).11.4(2x-1)(2-x).20.(x+3y)(x+y).21.(x-6)(x+24).27.(3+2a)(2-3a).31.(x+y)(x-y-1).38.(x+2y-7)(x+2y+5).
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