Question

помогите упростить
1.3√8 + √2 -3√18
2. (√5 - √2
3. ( 2- √3 ) (2+√3)

Answer 1

1)$3 sqrt{8} + sqrt{2} -3 sqrt{18}=6 sqrt{2} + sqrt{2} -9sqrt{2} =- sqrt{2}$
3) $(2- sqrt{3} )(2+ sqrt{3} )= 2^{2} - sqrt{3}^2=4-3=1$