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数学
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化简2x-[3y-5x-(2x-7y)],得什么
人气:178 ℃ 时间:2020-04-01 06:16:27
解答
原式=2x-(3y-5x-2x+7y)=2x-3y+5x+2x-7y=(2+5+2)x-(3+7)y=9x-10y
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