Ответ:
- \(\sqrt{49c}-\sqrt{16c}+\sqrt{25c}=7\sqrt c-4\sqrt c+5\sqrt c=8\sqrt c\).
- \(\sqrt{8m}-0.2\sqrt{200m}+3\sqrt{72m}=2\sqrt{2m}-0.2\cdot10\sqrt{2m}+3\cdot6\sqrt{2m}=2\sqrt{2m}-2\sqrt{2m}+18\sqrt{2m}=18\sqrt{2m}\).
- \((7\sqrt2-\sqrt{98}+\sqrt{10})\sqrt2=14-\sqrt{196}+\sqrt{20}=14-14+2\sqrt5=2\sqrt5\).
Ответ: а) \(8\sqrt c\); б) \(18\sqrt{2m}\); в) \(2\sqrt5\).
