Degree of polynomial: the degree of the single term that is the maximum sum of the letter index; Number of terms: the number of monomials (including constant terms without letters); Constant term: it is a term without letters. In short, the number of times of letter index and maximum monomial is "several times", and several monomials are "several items".

For example, 2a+45abc has two terms with cubic degree, so it is a cubic binomial, and 5x-xy+ 123xy is a quadratic trinomial.

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