Đáp án + Giải thích các bước giải:

Bài `2:`

`a)` `\sqrt(36.81)`

`=` `sqrt(36).sqrt(81)`

`=` `6.9`

`=` `54`

`b)` `sqrt(49.121.169)`

`=` `sqrt(49).sqrt(121).sqrt(169)`

`=` `7.11.13`

`=` `1001`

`c)` `sqrt(50^2-14^2)`

`=` `sqrt(50-14).sqrt(50+14)`

`=` `sqrt(36).sqrt(64)`

`=` `6.8`

`=` `48`

`d)` `sqrt(3+sqrt(5)).sqrt(3-sqrt(5))`

`=` `sqrt(3^2-sqrt(5)^2)`

`=` `sqrt(9-5)`

`=` `sqrt(4)`

`=` `2`

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