0.1X/0.03-0.9-0.2X/0.5=1
人气：498 ℃ 时间：2020-06-05 00:35:38
解答
0.1x/0.03-(0.9-0.2x)/0.7=1
10x/3-(9-2x)/5=1
50x-3(9-2x)=15
50x-27+6x=15
56x=42
x=0.75
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