Решить неравенство : f(x) > 0 , если f(x) = 4x - (1/2)*x^2
F(x) = 4x - (1/2)*x²4x - (1/2)*x²>0(1/2)*x²-4x<0(1/2)*x²-4x=01/2x(x-8)=0<br>1/2x=0 x-8=0 x=0 x=8 x∈(0;8)