Question

СРОЧНО!!!


1) ($5 sqrt{3}$+$sqrt{27}$)$sqrt{3}$
2) ($sqrt{5}-1$)$^{2}$($2 sqrt{5}+1$)$^{2}$

Answer 1

$1)(5 sqrt{3}+ sqrt{27})cdot sqrt{3} =5 sqrt{3}cdot sqrt{3} + sqrt{27}cdot sqrt{3}=5cdot3+9=15+9=24 \ \ 2) ( sqrt{5}-1)^{2}cdot (2 sqrt{5}+1 ) ^{2}=(5-2 sqrt{5}+1)cdot (20+4 sqrt{5}+1)= \ \ =(6-2 sqrt{5})cdot (21+4 sqrt{5})=6cdot 21-42 sqrt{5}+24 sqrt{5}-8cdot 5=86-18 sqrt{5}$