Question

[Huy Võ]

Giải giúp bài 5 6 7 8  của bài 15 i

Answer 1

[Yeutoanhoc]

`5)(6-sqrt6)/(1-sqrt6)+(6-sqrt6)/sqrt6=(sqrt6(sqrt6-1))/(1-sqrt6)+(sqrt6(sqrt6-1))/sqrt6=-sqrt6+sqrt6-1=-1` $\\$ `6)1/(sqrt2-sqrt3)-1/(sqrt3+sqrt2)=(sqrt2+sqrt3)/(2-3)-(sqrt3-sqrt2)/(3-2)=-(sqrt2+sqrt3)-sqrt3+sqrt2=-2sqrt3` $\\$ `7)1/(sqrt5+sqrt3)-1/(sqrt5-sqrt3)=(sqrt5-sqrt3)/(5-3)-(sqrt5+sqrt3)/(5-3)=(sqrt5-sqrt3-sqrt5-sqrt3)/2=-sqrt3` $\\$ `8)6/(1-sqrt3)-(3sqrt3-3)/(sqrt3+1)=(6(1+sqrt3))/(1-3)-(3(sqrt3-1)^2)/(3-1)=(-6(sqrt3+1)-3(4-2sqrt3))/2=-9`

Answer 2

[Huy Võ]

thank