题目内容
计算:(x2y-
xy2-2xy)÷
.
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(x2y-
xy2-2xy)÷
=(x2y-
xy2-2xy)×2
=x2y•2-
xy2•2-2xy•2
=2x2y-xy2-4xy.
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=(x2y-
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=x2y•2-
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=2x2y-xy2-4xy.
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