√1/20 √1/60 3/98 √3/20+√1/60-2√1/15

a) `\sqrt{(1)/(20)}`

`=(\sqrt{1})/(\sqrt{20})`

`=(\sqrt{20}.\sqrt{1})/(\sqrt{20}.\sqrt{20})`

`=(\sqrt{20})/(20)`

`=(2\sqrt{5})/(20)`

`=\sqrt{5}/(10)`

b) `\sqrt{(1)/(60)}`

`=(\sqrt{1})/(\sqrt{60})`

`=(\sqrt{1}.\sqrt{60})/(\sqrt{60}.\sqrt{60})`

`=(\sqrt{60})/(60)`

`=(2\sqrt{15})/(60)`

`=(\sqrt{15})/(30)`

c) `\sqrt{(3)/(98)}`

`=(\sqrt{3})/(\sqrt{98})`

`=(\sqrt{3}.\sqrt{98})/(\sqrt{98}.\sqrt{98})`

`=(\sqrt{294})/(98)`

`=(7\sqrt{6})/(98)`

`=(\sqrt{6})/(14)`

d) `\sqrt{3/(20)}+\sqrt{(1)/(60)}-2\sqrt{1/(15)}`

`=(\sqrt{3})/(\sqrt{20})+(\sqrt{1})/(\sqrt{60})-2.(\sqrt{1})/(\sqrt{15})`

`=(\sqrt{3}.\sqrt{20})/(\sqrt{20}.\sqrt{20})+(\sqrt{1}.\sqrt{60})/(\sqrt{60}.\sqrt{60})-2.(\sqrt{1}.\sqrt{15})/(\sqrt{15}.\sqrt{15})`

`=(\sqrt{60})/(20)+(\sqrt{60})/(60)-(2\sqrt{15})/(15)`

`=(2\sqrt{15})/(20)+(2\sqrt{15})/(60)-(2\sqrt{15})/(15)`

`=2\sqrt{15}(1/(20)+1/(60)-1/(15))`

`=2\sqrt{15}((3)/(60)+(1)/(60)-(4)/(60))`

`=2\sqrt{15}.0`

`=0`