0bvtyfyf65edddddddddddd565d
<span>X ( X квадрат+4X-21)=0
</span>X=0 или X квадрат+4x-21=0
x1 + x2 = -4x
x1*x2=-21
x1=-7 x2=3
Ответ:0, -7, 3.
(x+8) :(x²+16x+64)/(x-8) =(x+8) :(x +8)²/(x -8) =(x +8) *(x -8)/(x+8)² =(x+8)(x -8) /(x+8)² =(x -8) /(x +8) =(12 -8) /(12 +8) =4/20 =1/5 =0.2
ответ: 0.2
(5 корень из 5)^2=25*5=125