Ответ:
а) = 0.2x+1
-2/3 = 0.2x+1
-5/3 = 1/5x
x = -25/3
x = -8 1/3
б) - =
=
1/3x+5/6 = 2
1/3x = 7/6
x = 21/6
x = 3 3/6
в) √(x² - 6) = √(-5x)
x² - 6 = -5x
x² + 5x - 6 = 0
(x+6)(x-1)=0
г) 2sin(x)+1 = 0
2sin(x) = -1
sin(x) = -1/2
x = arcsin(-1/2)
= -30°; = -150°
либо в радианах
= -pi/6; = -5pi/6