题目内容

计算:
(1)
3b2
4a2
•(-
a
6b
)

(2)(9-x2
x2-3x
x

(3)(
a3
-2b
)÷(-
a2
b
)3•(
b
2
)2

(4)(
x2-y2
xy
)2÷(x+y)2•(
x
x-y
)3
(1)原式=-
b
8a


(2)原式=-(x+3)(x-3)•
x
x(x-3)

=-x-3;

(3)原式=
a3
-2b
•(-
b3
a6
)•
b2
4

=
b3
8a3


(4)原式=
(x+y)2(x-y)2
x2y2
1
(x+y)2
x3
(x-y)3

=
x
xy2-y3
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