The coefficient appears in the monomial, and the number before the letter is called the coefficient. For example, the coefficient of 3a is 3, the coefficient of 5.8z is 5.8, the coefficient of -6b is -6, and so on. If there is only one letter, such as B, one 1 is actually omitted, that is, the coefficient is 1. The coefficient of y is 1. The coefficient of -a is-1.

A single term constitutes a polynomial, so when you ask which term in the polynomial has a coefficient, you can find the coefficient of which term in the polynomial according to the method of finding the single term coefficient. Note: For example, in the polynomial 3.8y-a-2z, the coefficient of the third term is -2 instead of 2, because the preceding symbol cannot be omitted when calculating the coefficient of one term in the polynomial.