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1/(√10 -3)= (√10+3) / (√10-3)(√10+3)=(√10+3) /(10-9)=√10+3
odp. A
2]
-(√10-3)=-√10+3=3-√10
C
3]
a]
(√(6+4√2) +√(6-4√2) )²=√(6+4√2)²+2√[(6+4√2)(6-4√2)] +√(6-4√2)²=
6+4√2+6-4√2+2√(36-32)=12+2√4=12+4=16
b]
[(√(7-2√10) -√(7+2√10)]²=√(7-2√10)²-2√[(7-2√10)(7+2√10)]+√(7+2√10)²=
7-2√10+7+2√10-2√(49-40)=14-2√9=14-6=8