Raising power means sorting a polynomial according to the index of fixed letters from small to large; Decreasing power means sorting polynomials according to the exponent of fixed letters, from largest to smallest.

Arranging a polynomial according to the exponent of a letter from small to large is called arranging polynomials in ascending order of this letter. When polynomials are arranged in ascending or descending order of letters, sometimes there is a phenomenon of missing items. ?

Arranging the terms of a polynomial from large to small according to the exponent of a letter is called the descending power of the letter. For example, ab+(-2ba)+a is the power of a.

The origin of power in mathematics;

"Force" in mathematics is an extension of the literal meaning of "force", which originally refers to covering things with cloth towels. In mathematics, "power" is the result of power, and the expression of power is realized by adding a mark to a number, so it is like "putting a headscarf on a number", which means upgrading in reality, so it is just right to use mathematics to call the power of power.