a,$\sqrt[]{11+2√10}$ =$\sqrt[]{(√10+1)²}$ =√10+1
b,$\sqrt[]{5+2√6}$ =$\sqrt[]{(√2+√3)²}$ =√2+√3
c,$\sqrt[]{11+6√2}$ =$\sqrt[]{(3+√2)²}$ =3+√2
d,$\sqrt[]{7+2√10}$ =$\sqrt[]{(√7+√3)²}$= √7+√3
e,$\sqrt[]{94-42√5}$ =$\sqrt[]{(7-3√5)²}$ =7-3√5
g,$\sqrt[]{9-2√14}$ =$\sqrt[]{(√7-√2)²}$ =√7-√2(vì √7-√2>0)
