Question

Решите уравнение (14y + 21)(1,8 – 0,3y) = 0​

Answer 1

$left { {{14y+21=0} atop {1,8-0,3y=0}} right. left { {{y=-frac{21}{14}=-1,5 } atop {y=frac{1,8}{0,3}=6 }} right.$