(6-X)/(8-X)=3/5
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(6-X)/(8-X)=3/5
(6-X)/(8-X)=3/5
(6-X)/(8-X)=3/5
(6-X)/(8-X)=3/5
交叉相乘得:
3(8-x)=5(6-x)
24-3x=30-5x
2x=6
x=3
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