Question

решите уравнение 1/3y+5/9y=7,2

Answer 1

1/3y+5/9y=7.2
y(1/3+5/9)=7.2
y(7/9)=7.2
y(8/9)=36/5
y=36/5:8/9
y=36/5 * 9/8
y=36*9/5*8
y=8.1