问题 解答题
计算:
(1)
9
+|-
3
|+(-2)3-
3
+
3-8

(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y.
答案

(1)

9
+|-
3
|+(-2)3-
3
+
3-8

=3+

3
-8-
3
-2,

=-7.

(2)[x(x2y2-xy)-y(x2-x3y)]÷3x2y,

=(x3y2-x2y-x2y+x3y2)÷3x2y,

=(2x3y2-2x2y)÷3x2y,

=

2
3
xy-
2
3

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