1/2(3xy+2x²)-3(x²-1/2xy)化简 并求值
人气:486 ℃ 时间:2019-12-19 04:54:21
解答
1/2(3xy+2x²)-3(x²-1/2xy)
=3/2xy+x²-3x²+3/2xy
=3xy-2x²
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