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负8m的平方-【4m-2m的平方-(3m-2m的平方-7)】请问怎么写?
人气：459 ℃　时间：2020-02-03 10:24:30
解答
-8m²-[4m-2m²-(3m-2m²-7)]
=-8m²-(4m-2m²-2m+2m²+7)
=-8m²-(2m+7)
=-8m²-2m-7
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