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2. 5^100+5^100+5^100+5^100+5^100=5*5^100=5^101
3. (pier(2-√3)-pier(2+√3))²=(pier(2-√3)²-2pier(2-√3)*pier(2+√3) +pier (2+√3)²=
2-√3-2pier(2-√3)(2+√3)+2+√3=4- 2pier(2²-√3²)=4-2pier(4-3)=4-2*1=2