giải giúp mk vs ạ. Mk cảm ơn

`a)`

`A=\sqrt{37^2-12^2}`

`=\sqrt{1369-144}`

`=\sqrt{1225}`

`=\sqrt{(35)^2}`

`=|35|`

`=35`

Vậy `A=35`

`b)` 

`B=\sqrt{21,8^2-18,2^2}`

`=\sqrt{475,24-331,24}`

`=\sqrt{144}`

`=\sqrt{(12)^2}`

`=|12|`

`=12`

Vậy `C=12`

`c)`

`C=\sqrt{100.(6,5^2-1,6^2)}`

`=\sqrt{100.(42,25-2,56)}`

`=\sqrt{100.39,69}`

`=\sqrt{3969}`

`=\sqrt{(63)^2}`

`=|63|`

`=63`