4/9 *(2,7m-2 1/4n)-4,2(5/7m-0,5)/ это дробь2 целых одна четвёртаярешите пожалуйста!!я решила хочу проверить
4/9(2,7m-9n/4)-4.1(5m/7-0.5)=1.2m-n-41/10*5m/7+2.05=1.2m-205m/70-n+2.05=6m/5-205m/70- n+2.05= -121/70 -n+2.05
-121-70n+ 143.5/70=22.5-70n/70
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4/9(2,7m-9n/4)-4.1(5m/7-0.5)=1.2m-n-41/10*5m/7+2.05=1.2m-205m/70-n+2.05=6m/5-205m/70- n+2.05= -121/70 -n+2.05
-121-70n+ 143.5/70=22.5-70n/70