Question

решите уравнения (2у+5)×4=100 ,12×(2х-4)=336

Answer 1

(2у+5)*4=100
(2у+5)=100:4
2у+5=25
2у=25-5
2у=20
у=20:2
у=10
Ответ 10

Answer 2

$(2y + 5) \times 4 = 100 \\ 8y + 20 - 100 = 0 \\ 8y - 80 = 0 \\ 8y = 80 \\ y = 80 \div 8 \\ y = 10$
$12 \times (2x - 4) = 336 \\ 24x - 48 - 336 = 0 \\ 24x + 384 = 0 \\ 24x = - 384 \\ x = - 384 \div 24 \\ x = - 16$