求未知数x. 4x+7.1=12.5-2x 21x=21/67:9/67 13/7:0.8=x:14%
问题描述:
求未知数x.
4x+7.1=12.5-2x | 21x=
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1
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答
(1)4x+7.1=12.5-2x, 4x+7.1+2x=12.5-2x+2x, 6x+7.1=12.5, 6x+7.1-7.1=12.5-7.1, &...