Question

решите уравнение : 4/9у+1/3у=6.3

Answer 1

(4/9+1/3)y=6,3
(4/9+1/3*3)y=6,3
(4+3/9)y=6,3
7/9y=6,3
y=63/10:7/9
y=63*9/10*7
y=81/10
y=8,1