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47×45/46+22×22/23 =(46+1)x45/46+22x(1-1/23) =46x45/46+45/46+22-22x1/23 =45+45/46-22-22/23 =23-1/46 =22又45/46 手機提問的朋友在用戶端右上角評估點【滿意】即可.
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