题目内容
计算:
(1)
•(-
);
(2)(9-x2)÷
;
(3)(
)÷(-
)3•(
)2;
(4)(
)2÷(x+y)2•(
)3.
(1)
3b2 |
4a2 |
a |
6b |
(2)(9-x2)÷
x2-3x |
x |
(3)(
a3 |
-2b |
a2 |
b |
b |
2 |
(4)(
x2-y2 |
xy |
x |
x-y |
(1)原式=-
;
(2)原式=-(x+3)(x-3)•
=-x-3;
(3)原式=
•(-
)•
=
;
(4)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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