9
7/3√21=7/3*21=√21/9
6/5√10=6√10/5*10=3√10/25
2/(1-√3)/(1-3)=-2(1-√3)/2=√3-1
√6/(5-2√6)=√6(5+2√6)/(25-24)=√6(5+2√6)=5√6+12
(2-√5)/(2+√8)=(2-√5)²/(4-5)=-(2-√5)²=-(4=4²5+5)=4√5-9
10
√3(√12-2√27)=√36-2√81=6-2*9=6-18=-12
√48-2√3(2-5√12)=4√3-4√3+10*6=60
(3+√3)(2+√3)=6+3√3+2√3+3=9+5√3
(√6+√5)²-√120=6+2√30+5-2√30=11
11
(3-2√5)²=9-12√5+20=29-12√5
(2+√7)²=4+4√7+7=11+4√7
(√3-√3)³=3√3-9√2+12√3-2√2=15√3-11√2
(5+√5)³=125+75√5+75+5√5=200+80√5