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7.4X9.8-14.5=(7.4X10-7.4X0.2)-14.5=(74-1.48)-14.5=72.52-14.5=58.02
你好: 這個答案我一眼就看出來了,算灋說不上簡單複雜,主要是自己覺得快就好.囙此建議你在處理這些問題的時候進行簡單的分解. 8-7×14/2=8-7×7=8-49=-41 用擅長的能到的整數的除法比混著乘方便啦.回見.
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