(x+y)(x+y+z)=72
(y+z)(x+y+z)=120
(x+z)(x+y+z)=96
сложим ур-я
2(x+y+z)(x+y+z)=288 (x+y+z)²=144 (x+y+z)=+-12
(x+y+z)=12
x+y=6 y=6-x
y+z=10
x+z=8 z=8-x
6-x+8-x=10 2x=4 x=2 y=6-2=4 z=8-2=6
(x+y+z)=-12
x+y=-6 y=-6-x
y+z=-10
x+z=-8 z=-8-x
y+z= -6-x-8-x=-2x-14=-10 2x+14=10 2x=-4 x=-2
y=-6+2 y=-4 z=-8+2 z=-6