Ответы и объяснения

2013-04-17T11:10:29+04:00

2/9(45/100-2(7y/10))-2/7(51/100-3(4y/10))=16/100

2/9(9/20-27y/10)-2/7(51/100-34y/10)=4/25

2/9((9-270y)/20)-2/7((51-340y)/100)=4/25

-27y-289y/350=4/25

-9739y/350=4/25

-9739y=4/25*350

y= 9795