a+2√ab+4b (a+2√ab+4b)(√a-2√b) (√a)³ - (2√b)³
---------------------- = ------------------------------------ = ------------------------------- =
√a+2√b (√a+2√b)(√a-2√b) (√a)²- (2√b)²
(√a)³ - (2√b)³
= --------------------------------
a-4b
X^2 + 10X + 25 + X^2 - 20X + 100 = 2X^2
2X^2 - 10X + 100 - 2X^2 = 0
- 10X = - 100
X = 10
(x-1)(x+3)(x-4)/(x-2)≥0
x=1 x=-3 x=4 x=2
+ _ + _ +
---------------[-3]------------[1]---------------(2)-----------------[4]----------------
x∈(-∞;-3] U [1;2) U [4;∞)