1) f' (x) <0 и f (x) = -2/x^2 x ∈ (-∞,∞ ) т. е. x- любое
2) f' (x) <0 и f (x) = √2-x x ∈ (√2,∞ ), т.е. x > √2
3) f' (x) <0 и f (x) =3x-1/2x^2 = x*(3-1/2*x) x ∈ (-∞,0) и x ∈ (6,∞ ) т.е x < 0 и x > 6
4) f' (x) <0 и (x) = (3-x) (2*x+1) x ∈ (-∞,-0,5) и (3,∞ ) т. е. x < -0,5 и x > 3
1) f' (x) <0 и f (x) = -2/x^2 x ∈ (-∞,∞ ) т. е. x- любое
2) f' (x) <0 и f (x) = √2-x x ∈ (√2,∞ ), т.е. x > √2
3) f' (x) <0 и f (x) =3x-1/2x^2 = x*(3-1/2*x) x ∈ (-∞,0) и x ∈ (6,∞ ) т.е x < 0 и x > 6
4) f' (x) <0 и (x) = (3-x) (2*x+1) x ∈ (-∞,-0,5) и (3,∞ ) т. е. x < -0,5 и x > 3