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(4÷5/2+3/5)×1/7=11/35
(3/4)*(-1又(1/2)/(-2又(1/4)) =(3/4)*(-3/2)/(-9/4) =(3/4)*(-3/2)*(-4/9) =(3/4)*(-4/9)*(-3/2) =(-1/3)*(-3/2) =1/2
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