根號..是square root嗎?
For how many positive integers n does √n differ from √10 by less than
如果√n 減掉√10 并且小過1,那么n的正整數(shù)有多少個?
PS.是√10 不是√100
請參考以下計算（以√100為題）
-1 < √n - √100 < 1
-1 < √n - 10 < 1
9 < √n < 11
81 < n < 121
120-82+1= 39