1.把-x³+x²+x进行因式分解正确的是( )
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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
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
1.D.-x(x²-x-1)
2.D.-42
3.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-y)(a-bx+by)
7.若x+y=3,xy=-4..求2x²y+2xy²的值.
(用简便方法计算)
2x²y+2xy²
=2xy(x+y)
=2*(-4)*3
=-24
8.1.23*48+1.23*65-1.23*13
=1.23*(48+65-13)
=1.23*100
=123
9.18.6*0.125+13.4*1/8
=18.6*0.125+13.4*0.125
=(18.6+13.4)*0.125
=32*0.125
=32*1/8
=4
10.已知x²+x-1=0,求x³+2x²+2009的值
x²+x-1=0
x²+x=1
x³+2x²+2009
=x³+x²+x²+2009
=x(x²+x)+x²+2009
=x+x²+2009
=1+2009
=2010
2.D.-42
3.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-y)(a-bx+by)
7.若x+y=3,xy=-4..求2x²y+2xy²的值.
(用简便方法计算)
2x²y+2xy²
=2xy(x+y)
=2*(-4)*3
=-24
8.1.23*48+1.23*65-1.23*13
=1.23*(48+65-13)
=1.23*100
=123
9.18.6*0.125+13.4*1/8
=18.6*0.125+13.4*0.125
=(18.6+13.4)*0.125
=32*0.125
=32*1/8
=4
10.已知x²+x-1=0,求x³+2x²+2009的值
x²+x-1=0
x²+x=1
x³+2x²+2009
=x³+x²+x²+2009
=x(x²+x)+x²+2009
=x+x²+2009
=1+2009
=2010
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