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回澜阁教育免费下载天天更新提公因式法一、请你填一填(1)单项式-12x12y3与8x10y6的公因式是________.(2)-xy2(x+y)3+x(x+y)2的公因式是________.(3)把4ab2-2ab+8a分解因式得________.(4)5(m-n)4-(n-m)5可以写成________与________的乘积.二、认真选一选(1)多项式8xmyn-1-12x3myn的公因式是()A.xmynB.xmyn-1C.4xmynD.4xmyn-1(2)把多项式-4a3+4a2-16a分解因式()A.-a(4a2-4a+16)B.a(-4a2+4a-16)C.-4(a3-a2+4a)D.-4a(a2-a+4)A.c-b+5acB.c+b-5acC.c-b+51acD.c+b-51ac(4)用提取公因式法分解因式正确的是()A.12abc-9a2b2=3abc(4-3ab)B.3x2y-3xy+6y=3y(x2-x+2y)C.-a2+ab-ac=-a(a-b+c)D.x2y+5xy-y=y(x2+5x)三、请分解因式(1)x(x-y)-y(y-x)(2)-12x3+12x2y-3xy2回澜阁教育免费下载天天更新(3)(x+y)2+mx+my(4)a(x-a)(x+y)2-b(x-a)2(x+y)四、好好想一想1.求满足下列等式的x的值.①5x2-15x=0②5x(x-2)-4(2-x)=02.若a=-5,a+b+c=-5.2,求代数式a2(-b-c)-3.2a(c+b)的值.回澜阁教育免费下载天天更新参考答案一、(1)4x10y3(2)x(x+y)2(3)2a(2b2-b+4)(4)(m-n)4(5+m-n)二、(1)D(2)D(3)A(4)C三、(1)x(x-y)-y(y-x)=(x-y)(x+y)(2)-12x3+12x2y-3xy2=-3x(4x2-4xy+y2)=-3x(2x-y)2(3)(x+y)2+mx+my=(x+y)2+m(x+y)=(x+y)(x+y+m)(4)a(x-a)(x+y)2-b(x-a)2(x+y)=(x-a)(x+y)[a(x+y)-b(x-a)]=(x-a)(x+y)(ax+ay-bx+ab)四、1.①5x(x-3)=0,则5x=0,x-3=0,∴x=0或x=3②(x-2)(5x+4)=0,则x-2=0或5x+4=0,∴x=2或x=-542.∵a=-5,a+b+c=-5.2,∴b+c=-0.2∴a2(-b-c)-3.2a(c+b)=-a2(b+c)-3.2a·(b+c)=(b+c)(-a2-3.2a)=-a(b+c)(a+3.2)=5×(-0.2)×(-1.8)=1.8
本文标题:提公因式法同步练习题及答案
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