2) $$ \sqrt{0.49 \cdot 25} = \sqrt{0.49} \cdot \sqrt{25} = 0.7 \cdot 5 = 3.5$$
3) $$ \sqrt{56 \cdot 22} = \sqrt{112} = \sqrt{16 \cdot 7}=4\sqrt{7}$$
Ответ: 1) 43; 2) 3.5; 3) $$4\sqrt{7}$$