Question

уравнения 15с+45-12=78 (6у+14):2+15=40











э

Answer 1

15с=78-45+12
15с=45
с=3
(6у:2)+(14:2)+15=40
3у+7+15=40
3у=40-7-15
3у=18
у=6

Answer 2

15с+45-12=78
15с+33=78
15с=78-33
15с= 45
с=45:15
с=3

(6у+14):2+15=40
(6у+14):2=40-15
(6у+14):2=25
6у+14=25*2
6у+14=50
6у=50-14
6у=36
у=36:6
у=6