问题 解答题
计算:(x2y-
1
2
xy2-2xy)÷
1
2
答案

(x2y-

1
2
xy2-2xy)÷
1
2

=(x2y-

1
2
xy2-2xy)×2

=x2y•2-

1
2
xy2•2-2xy•2

=2x2y-xy2-4xy.

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