0.09х-0,12-0,21х+0,14=0,02-0,12х
0,09х-0,21х+0,12х=0,02-0,14+0,12
0х=0
0,29х+58-0,89х=154
0,29х-0,89х=154-58
-0,6х=96
-х=96/0,6
-х=160
х=-160
sinx-cosx=0 | :(1/√2)
(1/√2)sinx-(1/√2)cosx=0
sinxsin(π/4)-cosxcos(π/4)=0
cos(x+π/4)=0
x+π/4=π/2+πn, n - целое число
x=π/4+πn, n - целое число
2y^2-5y+2 раскладываем через D:
D = 25-16 = 9
y1 = (5-3)/4 = 0.5
y2 = (5+3)/4 = 2
2(y-0.5)(y-2)
...=(3y - 2)(3y + 2)(2-y)y / (2(y-0.5)(y-2)(3y + 2)(1 - y)) =
y(3y-2) / (2(y-0.5)(2y-1)) = Расскладываем y(3y-2)/(2(y-1)) через D1 (y-0.5) (2y-1):
2y^2 +2y +0.5
D1 = 0
y= -2/2 = -1
(y+1)
b(b^3-b^2+b)-(b^3-b^2+b) =
= b^4-b^3+b^2 -b^3 +b^2-b = b^4 -2b^3 +2b^2 -b