Tính lim x → 1 ( 3 x 2 − 2 x + 1 ) .7/20Tính \(\mathop {\lim }\limits_{x \to 1} \left( {3{x^2} - 2x + 1} \right)\). 1. 3. +∞. 2.Giải thíchD \(\mathop {\lim }\limits_{x \to 1} \left( {3{x^2} - 2x + 1} \right) = {3.1^2} - 2.1 + 1 = 2\).