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When do vectors and complex numbers learn?
They are all studying in high school.

Vector is the content of the second chapter of compulsory four, and complex number is the content to be learned next semester.

Mathematically, vectors (also known as Euclidean vectors, geometric vectors and vectors) refer to quantities with magnitude and direction, which can be visualized as line segments with arrows; Complex number field is an algebraic closure of real number field, that is, any polynomial with complex coefficients always has roots in complex number field.