如果7x-9=8-6x,那么7x-9+9+（）=8-6x+6x+（）.
如果7x-9=8-6x,那么7x-9+9+（）=8-6x+6x+（）.
数学人气：775 ℃时间：2019-10-11 06:35:38
优质解答
7x-9+9+（+6x）=8-6x+6x+（+9）
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