Đáp án+Giải thích các bước giải:
`a)(sqrt8-sqrt12)(sqrt2+sqrt3)=2(sqrt2-sqrt3)(sqrt2+sqrt3)=2.(-1)=-2` $\\$ `b)(sqrt45+sqrt63)(sqrt7-sqrt5)=sqrt9(sqrt5+sqrt7)(sqrt7-sqrt5)=3.(-2)=-6` $\\$ `c)(1/(1-sqrt3)-1/(1+sqrt3)):1/sqrt3=((1+sqrt3-1+sqrt3)/(-2))*sqrt3=-3` $\\$ `d)10-(sqrt32-sqrt8-sqrt27)(sqrt8-sqrt32-sqrt27)=10-(4sqrt2-2sqrt2-3sqrt3)(2sqrt2-4sqrt2-3sqrt3)=10-(2sqrt2-3sqrt3)(-2sqrt2-3sqrt3)=10-(27-8)=-9`