6 умножить на 4/5 = 24/5, 24/5 + 3 = 39/5, 39/5 - 1/2 = 73/10 = 7.3
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6 умножить на 4/5 = 24/5, 24/5 + 3 = 39/5, 39/5 - 1/2 = 73/10 = 7.3
64/5+3+(-1/2)=64/5+15/5=79/10-5/10=74/10 = 7,4