How to treat the number of algebraic expressions in junior high school mathematics is best to have examples and talk about them in detail.

The coefficient of algebraic expression is the number before each term. Should sign;

The degree is the number in the upper right corner of X (or other letters M, N), such as square 2, cubic 3, cubic 4 and so on.

The index that is not written in the upper right corner of the letter is 1.

But before you write, you should keep it simple, algebraic expression,

1 15 times. M is 15M, so the coefficient is 15 and the degree is1;

2.n 15 1 =115 * n, so the coefficient is115, and the degree is1.

3. 6 times of 1 = 1/3 *x*6=2x, so the coefficient is 2 and the degree is1.

Let me give you another example. The 2x^3 coefficient is 2 and the degree is 3.

The coefficient of-x 2 is-1, and the degree is 2.