Question

Помогите 15с + 45 _ 12 = 78. (6y + 14):2+15=40

Answer 1

15с+45-12=78
15с+45=90
15с=90-45
15с=45
с=45:15
с=3
15*3+45-12=45+45-12=78

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