Question

помогите умоляю, срочно

Answer 1

$left{begin{array}{c}xy+yz=8\yz+zx=9\zx+xy=5end{array}right ; oplus \----------\2(xy+yz+zx)=8+9+5\\xy+yz+zx=11\\xy=11-(yz+zx)=11-9=2; ,; ; y= frac{2}{x} \\yz=11-(zx+xy)=11-5=6; ,; ; frac{2}{x}cdot z=6; ,; z=frac{6x}{2}=3x\\zx=11-(xy+yz)=11-8=3; ,; ; z=frac{3}{x}\\3x=frac{3}{x}; ,; ; 3(x-frac{1}{x})=0; ,; ; frac{x^2-1}{x}=0; ,; ; frac{(x-1)(x+1)}{x}=0; ,\\x_1=-1; ,; ; x_2=1; ,; (xne 0)\\ z_1=3x_1=-3; ,; ; z_2=3; ,\\y_1=frac{2}{x_1}=frac{2}{-1}=-2; ,; ; y_2=frac{2}{1}=2\\Otvet:; ; (-1,-2,-3); ,; ; (1,2,3); .$