题目内容
计算:
(1)
+|-
|+(-2)3-
+
;
(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y.
(1)
| 9 |
| 3 |
| 3 |
| 3 | -8 |
(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y.
(1)
+|-
|+(-2)3-
+
,
=3+
-8-
-2,
=-7.
(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y,
=(x3y2-x2y-x2y+x3y2)÷3x2y,
=(2x3y2-2x2y)÷3x2y,
=
xy-
.
| 9 |
| 3 |
| 3 |
| 3 | -8 |
=3+
| 3 |
| 3 |
=-7.
(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y,
=(x3y2-x2y-x2y+x3y2)÷3x2y,
=(2x3y2-2x2y)÷3x2y,
=
| 2 |
| 3 |
| 2 |
| 3 |
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