Question

решите : |х|+y2+z2-2y+4z+5=0

Answer 1

|x| +(y^2-2y+1) + (z^2+4z+4) = 0
|x|+(y-1)^2 +(z+2)^2=0
x=0   y=1   z= - 2
Ответ (0; 1; - 2)