а) $$\sqrt{810 \cdot 40} = \sqrt{32400} = 180$$
в) $$\sqrt{72 \cdot 32} = \sqrt{2304} = 48$$
д) $$\sqrt{50 \cdot 18} = \sqrt{900} = 30$$
ж) $$\sqrt{90 \cdot 6} = \sqrt{540} = 6\sqrt{15}$$
e) $$\sqrt{2,5 \cdot 14,4} = \sqrt{36} = 6$$
з) $$\sqrt{16,9 \cdot 0} = \sqrt{0} = 0$$
Ответ: a) $$180$$, в) $$48$$, д) $$30$$, ж) $$6\sqrt{15}$$, e) $$6$$, з) $$0$$