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10/√5
= (10√5)/(√5√5)
= (10√5)/5
= 2√5

4√3/√2
= (4√3√2)/(√2√2)
= (4√6)/2
= 2√6

2/√18
= 2/(3√2)
= √2/3

(√5 - √2)/√10
= √10(√5 - √2)/10
= (5√2 - 2√5)/10

(√6 + √2)/(2√3)
= √3(√6 + √2)/6
= (3√2 + √6)/6

(√2 + √3 - 1)/√5
= √5(√2 + √3 - 1)/5
= (√10 + √15 - √5)/5