a)(m/m-1 - 1)* mn-n/m
b)4a²-9/9a²-6a+1 : 2a-3/3a-1 + 4-a/1-3a
в)(x²-5x/x²-10x+25 + 25/x²-25)* 5+x/125-x³
где-/ это дробь
ДАЮ 50 Баллов
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