Question

еши уравнение:
15+8=20−120.

Ответ: = .

Answer 1

Ответ:

$\frac{1}{5}y+8=20-\frac{1}{20}y |*20\\\\\frac{20*1}{5}y+8*20=20*20-\frac{20*1}{20}y$

Сокращаем  ⇒

$(4*1)y+8*20=20*20-1y\\\\4y+160=400-y\\\\4y+y=400-160\\\\5y=240\\\\y=240:5\\\\y=48$

Проверка:

$\frac{1}{5}*48 +8=20-\frac{1}{20}*48\\\\\frac{48}{5}+\frac{8}{1}=\frac{20}{1}-\frac{48}{20}\\\\\frac{192}{20}+\frac{160}{20}=\frac{400}{20}-\frac{48}{20}\\\\\frac{352}{20}=\frac{352}{20}$

y = 48