问题 解答题
计算:
(1)(-2x2y)2•(-3xy).
(2)(-
2
3
a2b
)•(
5
6
ac2
).
(3)<“m“:math dsi:zoomscale=150 dsi:_mathzoomed=1>(-12x2y)3•3xy2•(2xy2)2(-
1
2
x2y)3•3xy2•(2xy2)2

(4)-6m2n•(x-y)3
1
3
mn2(y-x)2
答案

(1)(-2x2y)2•(-3xy)

=4x4y2×(-3xy)

=-12x5y3

(2)(-

2
3
a2b)•(
5
6
ac2

=-

2
3
×
5
6
a3bc2

=-

5
9
3bc2

(3)(-

1
2
x2y)3•3xy2•(2xy2)2

=-

1
8
x6y3×3xy2×4x2y4

=-

3
2
x9y9

(4)-6m2n•(x-y)3

1
3
mn2(y-x)2

=-6×

1
3
m3n3(x-y)5

=-2m3n3(x-y)5

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单项选择题