Решите 7х2-5х=0 4х2=9
Если x2 - это x^2, то: 1. 7*x^2 - 5x = 0 x(7x - 5) = 0 x = 0 x = 5/7 2. 4*x^2 = 9 x^2 = 9/4 x = 3/2 x = -3/2