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计算:3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
-1/3ab-1/4a²+1/3a²-(-2/3ab)
人气:110 ℃ 时间:2020-01-25 05:08:47
解答
3xy-4xy-(-2xy)=-xy+2xy=xy
-1/3ab-1/4a²+1/3a²-(-2/3ab)
=-1/12(4ab+3a²-4a²-8ab)
=-1/12a²+1/3ab
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