1)(√5)²=5
=(3·5/5)=3
2)
= (2/9)+(5/6)=(4/18)+(15/18)=19/18
3)
= (√8)²-(√5)²=8-5=3
4)
=5²+2·5·√3+(√3)²=8+10√3
5)
=7·0,2+(1/6)·12=1,4+2=3,4
6)
√50=√(25·2)=√25·√2=5√2
√32=√(16·2)=√16·√2=4√2
=7√2-2·5√2+2·4√2=5√2
7)
√28·√7=(√4·√7)·√7=2·7=14
8)
√(7²·5⁴)=(√7²)·√(·5⁴)=7·5²=175