2х^2 + 2х + х + 1 = 0
2х^2 + 3х + 1 = 0
D = 3^2 - 4 × 1 × 2 = 9 - 8 = 1
√1 = 1
Х1 = -3 - 1 = -4 = -2
2 × 1 2
Х2 = -3 + 1 = -2 = -1
2 × 1 2
Х1 = -2 Х2 = -1
Х+9-18=-50
Х=-50-9+18
Х=-41
-(4-х)+15=12
-4+х+15=12
Х=12-15+4
Х=1
0.6-1.6х+6.4=21-1.2х
0.6+6.4-21=1.6х-1.2х
-14=0.4х
х=-35
60:17=3,5 часть книги прочитала Наташа