2019-04-29 21:56发布
18a(a-b）²-12(a-b)³
=(a-b）²（18a-12a+12b)
=6（a²-2ab+b²）(a+2b)
=6a³-18ab²+12b
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18a(a-b）²-12(a-b)³
=(a-b）²（18a-12a+12b)
=6（a²-2ab+b²）(a+2b)
=6a³-18ab²+12b
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