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4x-[9x平方-2(5x-x平方)-1/2(8-2x)]得多少
人气:221 ℃ 时间:2019-10-11 00:13:28
解答
4x-[9x²-2(5x-x²)-1/2(8-2x)]
=4x-[9x²-10x+2x²-4+x]
=4x-[11x²-9x-4]
=-11x²+13x+4
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