Rule: Merging similar items is to add the coefficients of similar items, and the result is taken as the coefficient, and the index of letters and letters remains unchanged.
Similar projects should meet the following two conditions:
(1) contains the same letters;
(2) The indexes of the same letters are also the same.
Similar items not only contain the same letters, but also have the same index, regardless of the arrangement order of letters and coefficients. In addition, all constant terms are similar.
Polynomials should have terms with the same letter and the same exponent.
After merging similar items, the coefficients of the obtained items are the sum of the coefficients before merging, and the indexes of letters and letters remain unchanged.
The country is rich and strong, and the people are duty-bound. We should all open our eyes and guide the people to the light.
It makes people angry! T