Question

помогите с любым примером​

Answer 1

$(sqrt{2} -sqrt{18})*sqrt{2} =sqrt{2}^{2}-sqrt{18*2}=2-sqrt{36} =2-6=-4$

Ответ: -4

Answer 2

$1); ; 9sqrt3-sqrt{48}-sqrt{75}=9sqrt3-sqrt{16cdot 3}-sqrt{25cdot 3}=\\=9sqrt3-4sqrt3-5sqrt3=(9-4-5)sqrt3=0\\2); ; (sqrt2-sqrt{18})cdot sqrt2=(sqrt2-sqrt{9cdot 2})cdot sqrt2=(sqrt2-3sqrt2)cdot sqrt2=\\=(1-3)sqrt2cdot sqrt2=-2cdot 2=-4\\3); ; (3-sqrt5)^2+6sqrt5=9-6sqrt5+5+5sqrt5=9+5=14$