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数学
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0.3*X-X*0.25=0.15-0.7*X X多少急用
人气:207 ℃ 时间:2020-02-05 14:22:41
解答
0.3*X-X*0.25=0.15-0.7*X
0.05x=0.15-0.7*X
0.75x=0.15
x=0.2
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