1-1 (1/ln2-1)140/3
1-2 7800
1-3  (a,b)= (+_2/sqrt5,+_1/sqrt5) 부호바꿔가면서 총4개
최솟값=(8/sqrt5)*1013
2-1 12(a^2-12)(sqrt(a^2-9))
2-2 a=6,a=(3sqrt6)/2
2-3 9/(4sqrt7)

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