Известно, что xyz+xy+yz+xz+x+y+z = 2,
yzt+yz+yt+zt+y+z+t = 3,
ztx+zt+zx+tx+z+t+x = 4,
txy+tx+ty+xy+t+x+y = 5.
Чему тогда равно x+y+z+t ? Ответ округлите до тысячных.
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