rút gọn !!!!!!!please

Đáp án:

 `21, 2sqrt{3}-sqrt{2}-4`

`22, 4sqrt{3}`

Giải thích các bước giải:

 `21, (3-2sqrt{3})/sqrt{3}+(2-sqrt{2})/(1-sqrt{2})-(2-sqrt{3})`

`=(sqrt{3}(sqrt{3}-2))/sqrt{3}+(sqrt{2}(sqrt{2}-1))/(1-sqrt{2})-2+sqrt{3}`

`=sqrt{3}-2-sqrt{2}-2+sqrt{3}`

`=2sqrt{3}-sqrt{2}-4`

`22,5sqrt{48}-4sqrt{27}-2sqrt{75}+sqrt{108}`

`=5sqrt{16.3}-4sqrt{9.3}-2sqrt{25.3}+sqrt{36.3}`

`=5.4sqrt{3}-4.3sqrt{3}-2.5sqrt{3}+6sqrt{3}`

`=20sqrt{3}-12sqrt{3}-10sqrt{3}+6sqrt{3}`

`=4sqrt{3}`