\[ \sqrt{49(m - 2)^{2}} - 5m, \, m < 2. \] \[ 7 \, 1 \, m - 21 - 5m. \] \[ \sqrt{(x - 2)^{2}} + \sqrt{(x - 7)^{2}} \quad 2 \leq x \leq 7. \] \[ 0 \sqrt{5y} \quad \sqrt{80y} - 7y, \, y \geq 0. \]

----- Nội dung ảnh -----
\[
\sqrt{49(m - 2)^{2}} - 5m, \, m < 2.
\]
\[
7 \, 1 \, m - 21 - 5m.
\]
\[
\sqrt{(x - 2)^{2}} + \sqrt{(x - 7)^{2}} \quad 2 \leq x \leq 7.
\]
\[
0 \sqrt{5y} \quad \sqrt{80y} - 7y, \, y \geq 0.
\]