Question

1. $\frac{1}{2}\sqrt{80} - \frac{2}{3} \sqrt{45} + \frac{1}{6} \sqrt{180}$
2. $2[3 \sqrt{12} - 2( \sqrt{27} - 5 )] - 6 \sqrt{ (-1^) {2} }$
3. $|1- \sqrt{3}| +3(1+ \sqrt{2} - \sqrt{3} ) - 2 \sqrt{2} (1- \sqrt{2} )+ \sqrt{3}(2-2 \sqrt{3} )$
Ajutor, va rog! :*

Answer 1

1) 1/2√80 -2/3 √45 +1/6√180 =
=4√5/2 -6√5/3+6√5/6=
=2√5-2√5+√5=√5

2. 2[3√12-2(√27-5)]-6√(-1)²=
= 2[6√3-2(3√3-5)]-6=
= 2[6√3-6√3+10)]-6=
=2*10-6=20-6=14

3.I1-√3I+3(1+√2-√3)-2√2(1-√2)+√3(2-2√3)=
1-√3<0
I1-√3I  =-(1-√3)=√3-1 
=√3-1+3+3√2-3√3-2√2+4+2√3-6=
=√2