Х²+4х-2 <(x+3)(x-3)
x²+4x-2<x²-9
4x< -7
x< -1 3/4
x< -2 (C)
Ответ:
12.
Объяснение:
(4√3-2√5)×√3+√60 = 4√3•√3 - 2√5•√3+√(4•15) = 4•3 - 2√15 + 2√15 = 12 + 0 = 12.
<span>Ab-ac-c^2+b^2 = a(b - c) - (b^2 - c^2) = a(b - c) - (b - c)(b + c) = (b - c)(a - b - c)</span>