Х²+4х-2 <(x+3)(x-3)
x²+4x-2<x²-9
4x< -7
x< -1 3/4
x< -2 (C)
(13,5-8,5)(13,5+8,5)/(73,5-68,5)(73,5+68,5)=5*22/5*142=11/71
<span>2х² · 7ху² - 4х²у (-ху) - 3х · 5х²у² = 14 х</span>³<span>у</span>²<span> - 4х</span>³<span>у</span>²<span> - 15х</span>³<span>у</span>²<span> = -5х</span>³<span>у</span>²
-5х³у² х = -3, у=5
-5 . (-3)³ . 5² = 3375
(-3)³ = -27
5² = 25
-5 . (-27) = 135
135 . 25 = 3375