4分之50-X=0.8:2 49:(X-10)=14:2

问题描述:

4分之50-X=0.8:2 49:(X-10)=14:2
等于多少 急

50/4-X=0.8:2x=25/2-2/5 x=121/1049:(X-10)=14:2 49*2=(x-10)*14 98=14x-140 14x=238 x=17
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