Đáp án:
`A=1`
Giải thích các bước giải:
`A=((2+sqrt3)sqrt(2-sqrt3))/(sqrt(2+sqrt3))`
`A=(sqrt2(2+sqrt3)sqrt(2-sqrt3))/(sqrt2 . sqrt(2+sqrt3))`
`A=((2+sqrt3)sqrt(4-2sqrt3))/(sqrt(4+2sqrt3))`
`A=((2+sqrt3)sqrt(3-2sqrt3+1))/(sqrt(3+2sqrt3+1))`
`A=((2+sqrt3)sqrt((sqrt3-1)^2))/(sqrt((sqrt3+1)^2)`
`A=((2+sqrt3)(sqrt3-1))/(sqrt3+1)`
`A=(2sqrt3-2+3-sqrt3)/(sqrt3+1)=(sqrt3+1)/(sqrt3+1)`
`A=1`
