1/4*4/9=1/9
1/7*2=1/14
2 2/5*5/6=12/5*5/6=2
(1/5+2/15)*3/4=1/3*3/4=1/4
(1/2-1/3)*6=1/6*6=1
(1/7*2 1/3)-исправь ошибку.
Надо просто обе части поделить на 28⇒y=27
(42/5х+32/9):25/6=4/3
(42*6)/(5х*25)+(32*6)/(9*25)=4/3
252/(125х)+64/75=4/3
252/(125х)=4/3-64/75=100/75-64/75=36/75
252/(125х)=36/75
125х=(252*75)/36
125х=525
х=4,2=4 2/10=4 1/5