помогите пожалуйста )))
х-у+2z=?
x+y=4
y+z=8
x+z=6
х+z-(x+y)=z-y=6-4=2
х-у+2z=x+z+z-y=6+2=8
Ответ 8
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х-у+2z=?
x+y=4
y+z=8
x+z=6
х+z-(x+y)=z-y=6-4=2
х-у+2z=x+z+z-y=6+2=8
Ответ 8