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b)√48-√3=4√3-√3=3√3
c)√12+√27=2√3+3√3=5√3
d)√45-√125=3√5-5√5=-2√5
e)0,2√50+0,8√72-0,3√32=0,2·5√2+0,8·6√2-0,3·4√2=√2+4,8√2-1,2√2=4,6√2
f)
3√20-⅓√45-5√180=3·2√5-⅓·3√5-5·6√5=6√5-√5-30√5=-25√5
zad4
a)3/√2=(3√2)/(√2·√2)=(3√2)/2
b)3/√7=(3√7)/(√7·√7)=3√7/7
c)5/(3√10)=(5√10)/(3·√10·√10)=5√10/30=√10/6