Answer:

The second question:

Answer:

This part of the extended materials mainly examines individual knowledge points:

An algebraic expression composed of the product of numbers or letters is called a monomial, and a single number or letter is also called a monomial (for example, 0 can be regarded as 0 times a, 1 can be regarded as 1 times a letter with an index of 0, and b can be regarded as b times 1), and the product of a fraction and a letter is also a monomial.

Any product of letters and numbers is a monomial. In division, dividing by a number is equal to multiplying the reciprocal of this number. A single letter or number is also called a monomial. 0 is also a number and a monomial. If the monomial contains only numeric factors, then its degree is 0.

A formula with letters in the denominator is not a monomial. Because the monomial is an algebraic expression, and the formula with unknown denominator is a fraction. When a number is multiplied by a letter, the number precedes the letter; The multiplication sign can be omitted as a dot or not written; The formula of division can be written as a fractional formula; Multiply the band score with the letter, and the band score will become a false score.