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[奇趣報導] 過百萬人答錯的數學題 10秒內算出:7 + 7 ÷ 7 + 7 x 7 - 7 =?

 
正確答案: 50

先乘除,後加減,7+(7÷7) + (7x7) - 7 = 7 +1 + 49 - 7 = 50

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