a)(√5+√2)²=(√5)²+2√5√2+(√2)²=√25+2√10+√4=5+2√10+2=7+2√10
b)(2-√3)²=(2)²-2×2√3+(√3)²=4-4√3+3=7-4√3
c)(√5-1)(√5+1)=(√5)²-1=√25-1
d)(2√5+2)(√5-1)=2√25-2√5+2√5-2=2×5-2=10-2=8
e)(√3-2)(2√3+1)=2√9+√3-4√3-2=2×3-3√3-2=6-3√3-2=4-3√3
f)(√8-1)(2√2+1)=2√16+√8-2√2-1=2×4+2√2-2√2-1=8-1=7
sucees
