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------ x. ------
√5. √5
= -√15
---------- = 1/5 √15
5
5) 4. √2. 4√2
---- x. ----- = ------- = 2√2
√2. √2. 2
6) 6. √3. 6√3
---- x -------- = -------= 2 √3
√3. √3. 3