1.

\left. \begin{array} { l } { \frac { 1.75 \times 1.75 - 0.25 \times 0.25 } { ( 1.75 + 0.25 ) } = 3 m } \\ { \frac { 599 ^ { 2 } - 104 ^ { 2 } } { m } = 660 } \end{array} \right.

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