1.√3/5*√12/5=√36/25=6/5
2.√3/4*√8/27=√3*8/4*27=√2/3
3.5√45*3/2√8/3=√25*45*9/4*8/3=15√30
4.√3(√18+√75)=√3*18+√3*75=3√6+15
5.(7√xy-3√yz)*(7√xy+3√yz)=49xy-9yz
6.(√5-√6)^201(√5+√6)^201=(5-6)^201=-1
7.(2√5-3)^2=(2√5)^2-2*2√5*3+9=29-4√5
8.√26+8/9=√26*9+8/9=11/3√2
9.√7/16y^2=√7/|4y|
10.√81c/a^b=9/(a^b/2)√c