........ ...........................
(y+5/7) * 1/3=2 4/9
(y+5/7)=2 4/9:1/3
(y+5/7)=22/9*3/1
y=22/3-5/7
y= 7 1/3 - 5/7
y=6 4/3 - 5/7
y= 6 28-15/21
y= 6 13/21
2) (5/12-x) : 1/2=2/9
5/12:1/2-x:1/2=2/9
5/6-2x=2/9
2x=5/6-2/9
2x=15/18-4/18
2x=11/18
x=11/36
3) (1 16/25+x)-4/5= 4 2/25
1 16/25+x=4 20/25+4/5
x= 4 2/25+20/25-1 16/25
x=22/25-1 15/25
x=3 6/25
4) 4/15 - (y+3/25)=1/25
4/15-y-3/25=1/25
-y=1/25+3/25-4/15
y= -17/75
5) ( 8 3/14-y) : 3/7=17
8 3/14 - y =17 * 3/7
8*14+3/14 -y = 17*3/7
115/14-51/7
y=115/14-51/7
y= 115/15 - 51*2/7*2
y=115/14-102/14
y=13/14
Пошаговое объяснение:
7,12*(1,9-х)=2,136
13,528-7,12х=2,136
-7,12х=-11,392
х=1,6