а)√18 + √32 -√50 = √2.3.3 + √4.4.2 - √2.5.5 = 3√2 + 4√2 - 5√2 = 2√2

б)4√18 - 9√8 + √50 = 4.3√2 - 9.√2.2.2 + 5√2 = 12√2 - 18√2 +5√2 = -√2

в) √(9-4√2).√(√32 + 9)=√9-4√2).√(9+4√2) = √(9-4√2)(9+4√2) = √81-32 = √49 = 7

д)(√7+√11)(11-√77) = (√7+√11)(11-√7√11)=(√7+√11).√11.(√11-√7) = √11.(11-7) = 4√11

ж)(3√5-6√2)(√5+2√2) = 3(√5-2√2)(√5+2√2)=3(5-=-9


2з

a)3b