15-5x<8x+2
13<13x
x>1
б)5x^2-22x-15<0
D=784
x1=22+28/10=5
x2=22-28/2=-0.6
x∈(-0.6;5)
№3
4x-x^2≥0
x(4-x)≥0
x1=0
x2=4
x∈[0;4]
15-5x<8x+2
13<13x
x>1
б)5x^2-22x-15<0
D=784
x1=22+28/10=5
x2=22-28/2=-0.6
x∈(-0.6;5)
№3
4x-x^2≥0
x(4-x)≥0
x1=0
x2=4
x∈[0;4]