化简 2x-[3y-5x-(-2x-7y)]等于 ( ) A:-7x+10y B:5x+4y C:-x-4y D:9x-10y
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化简 2x-[3y-5x-(-2x-7y)]等于 ( ) A:-7x+10y B:5x+4y C:-x-4y D:9x-10y
化简 2x-[3y-5x-(-2x-7y)]等于 ( ) A:-7x+10y B:5x+4y C:-x-4y D:9x-10y
化简 2x-[3y-5x-(-2x-7y)]等于 ( ) A:-7x+10y B:5x+4y C:-x-4y D:9x-10y
2x-[3y-5x-(-2x-7y)]
=2x-3y+5x-2x-7y
=5x-10y
无解
题目错了,你看看仔细
原式=2x-【3y-5x+2x+7y]=2x--(-3x+10y)=-5x-10y. 题目中没有正确答案。
就是5x-10y
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