Question

решите уравнения
(50-x)÷7+195=40×5
(270÷y-2)×30=7×120

Answer 1

(50-x)÷7+195=40×5
(50-х)/7+195=200
(50-х)/7=200-195
(50-х)/7=5
(50-х)=5*7
50-х=35
х=50-35
х=15


(270÷y-2)×30=7×120
(270/у-2)*30=840
(270/у-2)=840/30
(270/у-2)=28
270/у=28+2
270/у=30
у=270/30
у=9