1.把-x³+x²+x进行因式分解正确的是( )
问题描述:
1.把-x³+x²+x进行因式分解正确的是( )
A.-x(x²+x)B.-x(x²-x)C.-x(x²+x+1)D.-x(x²-x-1)
2.若a-b=6,ab=7,则ab²-a²b的值为( )
A.13 B.-13 C.42 D.-42
3.把多项式am²-2m²-ma+2m分解因式等于( )
A.(a-2)(m²+m)B.(a-2)(m²-m)C.m(a-2)(m-1)D.m(a-2)(m+1)
4.多项式﹙x^2n﹚-﹙x^n﹚提取公因式x^n后另一个因式是( )
A.﹙x^n﹚-1 B.x^n C.﹙x^2n-1﹚-1 D.(x^2n)-1
计算题
5.m²(a-2)+m(2-a) 6.a(x-y)-b(y-x)²
7.若x+y=3,xy=-4..求2x²y+2xy²的值.
(用简便方法计算)
8.1.23*48+1.23*65-1.23*13 9.18.6*0.125+13.4*1/8
(拓展提升)
10.已知x²+x-1=0,求x³+2x²+2009的值
答
1.D.-x(x²-x-1)2.D.-423.C.m(a-2)(m-1)4.A.﹙x^n﹚-1 计算题5.m²(a-2)+m(2-a)=m²(a-2)-m(a-2) =m(a-2)(m-1)6.a(x-y)-b(y-x)²=a(x-y)-b(x-y)²=(x-y)[a-b(x-y)]=(x-...