5м+7м=132 42х-28х+180=600
12м=132 14х+180=600
м=132:12 14х=600-180
м=11 14х=420
х=420:14
х=30
1.32x + 4 = 10 3/5
132/100x + 4 = 53/5
132/100х = 33/25х
33/25х = 53/5 - 4
33/25х = 53/5 - 20/5 = 33/5
33/25х = 33/5
х = 33/5 / 33/25 = 5
х = 5
Ответ: 5.
(1845:15+(873-689)•12):21-109= 2
1) 873-689=184
2) 1845÷15= 123
3) 184×12= 2208
4) 123+2208=2331
5) 2331÷21= 111
6) 111-109=2