Упростите выражение: √49c − √16c + √25c; √8m − 0,2√200m + 3√72m.

1. \(\sqrt{49c}-\sqrt{16c}+\sqrt{25c}=7\sqrt c-4\sqrt c+5\sqrt c=8\sqrt c\).
2. \(\sqrt{8m}-0{,}2\sqrt{200m}+3\sqrt{72m}=2\sqrt{2m}-0{,}2\cdot10\sqrt{2m}+3\cdot6\sqrt{2m}=2\sqrt{2m}-2\sqrt{2m}+18\sqrt{2m}=18\sqrt{2m}\).

Ответ: \(8\sqrt c;\ 18\sqrt{2m}\).