`M = x/(x + xy + 2025) + y/(yz + y + 1) + z/(xz + 2025z + 2025)`

Thay `2025 = xyz` ta có `:`

`M = x/(x + xy + xyz) + y/(yz + y + 1) + z/(xz + xyz^2 + xyz)`

`M = x/(x(yz + y + 1)) + y/(yz + y + 1) + 1/(x(yz + y + 1))`

`M = (x + yx + 1)/(x(yz + y + 1))`

Vậy `M = (yx + x + 1)/(x(yz + y + 1))`