題目:
5/7×(3/1-2/1)×7/3÷4/5等於多少
解答:
5/7×(3/1-2/1)×7/3÷4/5=5/7×(-6/1)×7/3×5/4=-30/7×7/3×5/4=-10/1×5/4=-25/2
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