方程X-5/2X=9 (2+7/4)X=7/5 4X*10/7=14 X除5/7=8/5/3/1

问题描述:

方程X-5/2X=9 (2+7/4)X=7/5 4X*10/7=14 X除5/7=8/5/3/1
*=乘 /等于分数线

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