怎么做的啊？
2016-10-19 20:06发布
-xy^2+3xy^2
3a-2a+2/3a
=(3-1)xy^2
=2xy^2
=（-1+3）xy^2
=（3-2+2/3）a
=5a/3
最多设置5个标签!
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-xy^2+3xy^2
=(3-1)xy^2
=2xy^2
-xy^2+3xy^2
=（-1+3）xy^2
=2xy^2
3a-2a+2/3a
=（3-2+2/3）a
=5a/3
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