(2/3 х - 4/5 ) *15 =8 2/3х - 4/5=8/15 2/3 х=8/15 +4/5 2/3 х=8/15+12/152/3х = 20/15 или 4/3х=4/3*3/2х=2 (5/7-2/3 у) *21=1 5/7 -2/3 у = 1/21 -2/3 у = 1/21-5/7 -2/3 у = 1/21-15/21 -2/3 у = -14 /21 или - 2/3 у = -2/3 : (-2/3 ) у = 1 2/3 х + 7/3 х = 18 9/3 х =18 х = 18 :9/3 =18*1/3х = 6 7 /12 m +2/3 m -1/4 m = 7 7 /12m +8/12m-3/12m=712/12m=7m=7:1m=7 Подробнее - на -
(5/7-2/3 у) *21=1
5/7 -2/3 у = 1/21 -2/3 у = 1/21-5/7 -2/3 у = 1/21-15/21 -2/3 у = -14 /21 или - 2/3 у = -2/3 : (-2/3 ) у = 1
2/3 х + 7/3 х = 18 9/3 х =18 х = 18 :9/3 =18*1/3х = 6
7 /12 m +2/3 m -1/4 m = 7 7 /12m +8/12m-3/12m=712/12m=7m=7:1m=7
Подробнее - на -