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数学
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( 3x²-2x+1)-2(x²-x)-x²其中x=-2012如何算
人气:231 ℃ 时间:2019-10-09 06:17:29
解答
(3x²-2x+1)-2(x²-x)-x²
=3x²-2x+1-2x²+2x-x²
=3x²-2x²-x²-2x+2x+1
=1
结果与x值无关.
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