青岛版初中数学七年级下册第十二章12.3练习卷
下列式子是因式分解的是( )
A.x(x-1)=x2-1 |
B.x2-x=x(x+1) |
C.x2+x=x(x+1) |
D.x2-x=x(x+1)(x-1) |
多项式8x2y2-14x2y+4xy3的公因式是( )
A.8xy | B.2xy | C.4xy | D.2y |
若x2+mx-15=(x+3)(x+n),则m的值是( )
A.-5 | B.5 | C.-2 | D.2 |
分解因式-2xy2+6x3y2-10xy时,合理地提取的公因式应为( )
A.-2xy2 | B.2xy | C.-2xy | D.2x2y |
将多项式-6a3b2-3a2b2+12a2b3分解因式时,应提取的公因式是( )
A.-3a2b2 | B.-3ab | C.-3a2b | D.-3a3b3 |
多项式14a3bc3+7a2b2c2在分解因式时应提取的公因式是( )
A.7a3bc3 | B.28a2b2c2 | C.7ab2c2 | D.7a2bc2 |
在m(a-x)(x-b)-mn(a-x)(b-x)中,公因式是( )
A.m | B.m(a-x) | C.m(a-x)(b-x) | D.(a-x)(b-x) |
分解8a3b2-12ab3c时应提取的公因式是( )
A.2ab2 | B.4ab | C.ab2 | D.4ab2 |
把10a2(x+y)2-5a(x+y)3因式分解时,应提取的公因式是( )
A.5a | B.(x+y)2 | C.5(x+y)2 | D.5a(x+y)2 |
-6xyz+3xy2-9x2y的公因式是( )
A.-3x | B.3xz | C.3yz | D.-3xy |
把a2-4a多项式分解因式,结果正确的是( )
A.a(a-4) | B.(a+2)(a-2) | C.a(a+2)(a-2) | D.(a-2)2-4 |
下列多项式中,能用提取公因式法分解因式的是( )
A.x2-y | B.x2+2x | C.x2+y2 | D.x2-xy+y2 |
多项式a-b+c(a-b)因式分解的结果是( )
A.(a-b)(c+1) | B.(b-a)(c+1) | C.(a-b)(c-1) | D.(b-a)(c-1) |
把多项式mx2-2mx分解因式,结果正确的是( )
A.m(x2-2x) | B.m2(x-2) | C.mx(x-2) | D.mx(x+2) |
某天数学课上,老师讲了提取公因式分解因式,放学后,小华回到家拿出课堂笔记,认真复习老师课上讲的内容,他突然发现一道题:-12xy2+6x2y+3xy=-3xy•(4y-______)横线空格的地方被钢笔水弄污了,你认为横线上应填写( )
A.2x | B.-2x | C.2x-1 | D.-2x-l |
若(x+2)3-4x(x+2)=k(x+2),则k的表达式为( )
A.x3-4x2-8x+8 | B.x3-4x2+8 | C.x2+4 | D.x3-4x2+4 |
(x-y)2-(y-x)因式分解的结果是( )
A.(y-x)(x-y) |
B.(x-y)(x-y-1) |
C.(y-x)(y-x-1) |
D.(x-y)(y-x-1) |
把多项式(a+1)(a-1)+(a-1)提取公因式(a-1)后,则另一个因式是______.