Вариант 9 ИДЗ 5.2

EDS - 5.2
№1.9 Prove that the functions f (x) = 3x / (1-x); φ (x) = x / (x + 4) as x → 0 are infinitely small of the same order of smallness.
№2.9 Find the limits.
№3.9 Investigate these functions for continuity and build their graphs.
№4.9 Investigate these functions for continuity at the specified points. f (x) = ....; x1 = 3; x2 = 4;