lim 2 n + 1 2 3 n 2 + 2 n − 1 n 2 + 3 n − 1 = lim 2 n + 1 2 2 n 2 + 7 n − 3 n 2 + 2 n n 2 + 3 n − 1 = lim n 2 2 + 1 n 2 . n 2 2 + 7 n − 3 n 2 n 2 1 + 2 n . n 2 1 + 3 n − 1 n 2 = lim 2 + 1 n 2 2 + 7 n − 3 n 2 1 + 2 n 1 + 3 n − 1 n 2 = 2 2 .2 1.1 = 8
Chọn đáp án D