`a) (\sqrt{32}.\sqrt{2}-\sqrt{8888}):\sqrt{2222}`
`=(\sqrt{64}-2\sqrt{2222}):\sqrt{2222}`
`=(8-2\sqrt{2222}):\sqrt{2222}`
`=(8\sqrt{2222})/2222-2`
`=(4\sqrt{2222})/1111-2`
`b) \sqrt{24}.\sqrt{6}-\sqrt{75}:\sqrt{3}-2`
`=\sqrt{4}.\sqrt{6}.\sqrt{6}-\sqrt{25}.\sqrt{3}:\sqrt{3}-2`
`=2.6-5-2`
`=12-7`
`=5`
`c) (3\sqrt{20}+5\sqrt{80}-4\sqrt{45}).sqrt{5}`
`=(3\sqrt{4}.\sqrt{5}+5.\sqrt{16}.\sqrt{5}-4.\sqrt{9}.\sqrt{5}).\sqrt{5}`
`=(6\sqrt{5}+20\sqrt{5}-12\sqrt{5}).\sqrt{5}`
`=14\sqrt{5}.\sqrt{5}`
`=70`
