(X-12)=5/6x*80%
x-12=2／3x
3x-36=2x
3x-2x=36
x=36
(X-12)=5/6x*80%計算過程
(X-12)=5/6x*80%計算過程
數(shù)學(xué)人氣：749 ℃時間：2020-07-19 17:37:39
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