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化简:2a²-[5a-1/2(a-3)+2a²]
2a²-[5a-1/2(a-3)+2a²]要每一步的过程
人气:307 ℃ 时间:2020-04-15 19:26:40
解答
2a²-[5a-1/2(a-3)+2a²]
=2a²-(5a-1/2a+3/2+2a²)
=2a²-5a+1/2a-3/2-2a²
=-9/2a-3/2
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