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2)
(7+√3)²+(7-√3)²=c²
49+14√3+3+49-14√3+3=c²
104=c² /√
c=√104
c=2√26 Obw.=7+√3+7-√3++2√26=14+2√26
3)
(√10-√2)=10-2√20+2=12-2√20
(2√3-7)(2√3+7)=4*3+14√3-14√3-49=12-49=-37
4)
4x²-4x-(9+12x+4x²)=
4x²-4x-9-12x-4x²=
4*(√2-1)²-4*(√2-1)-9-12*(√2-1)-4*(√2-1)²=
4*(3-2√2)-4√2+4-9-12√2+12-4*(3-2√2)=
12-8√2-4√2-5-12√2+12-12+8√2=
7-16√2
(√2-1)²=2-2√2+1=3-2√2