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原方程可化為: 8分之7*(x- 7分之3)÷(8分之5)=0.8 即:8分之7*(x- 7分之3)*(5分之8)=0.8 5分之7*(x-7分之3)=0.8 上式兩邊同乘以5可得: 7*(x-7分之3)=0.8*5 7x - 3=4 7x=7 解得:x=1
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