Вот там вообщем кос=0 и кос=-1 это частные случаи
А)
x^2 + 3x = 0
x (x + 3) = 0
x = 0; x = -3
б)
-x^2 + 8x = 0
x (-x + 8) = 0
x = 0; x = 8
в)
3x - x^2=0
x (3 - x) = 0
x = 0; x =3
г)
-7x + x^2 = 0
x (-7 + x) = 0
x = 0; x = 7
д)
19x - x^2 = 0
x (19 - x) = 0
x = 0; x = 19
е)
x^2 - 10x = 0
x (x - 10) = 0
x = 0; x = 10
F(x)= 4/x - 1/3
f(x)= -4/x^2
x∈ (0;∞)
F'(x)= (4/x)' - (1/3)' = 4(1/x)' - 0 = 4(x^-1)' = 4(-1)(x^-1-1) = -4(x^-2) = -4/x^2
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