Formal Addition And Subtraction Question And Answer

Abstract

Q How to correctly understand the concept of similar items? Items that contain the same letters and have the same number of times of the same letters are called homogeneous items. To understand this concept, we need to grasp three points: (1) the concept of similar items is established under the condition of comparing monomials, and a single item cannot be said to be a similar item; (2) a similar item must satisfy "two sameness" : ① the letters contained are the same; ② the number of the same letters is the same. The two are indispensable; (3) The same item has nothing to do with the coefficient, and has nothing to do with the order of the letters, but only with the letters and the number of letters. Q Is the algebraic formula X-y-X a monomial or a polynomial? Answer x-y-x represents the sum of 3 monomials, so it is a polynomial, and it cannot be said to be a monomial just because its result is y. Integers are divided into monomials and polynomials, and this classification is based on "whether there is an additional trial operation" as the standard, that is, on the basis of "form" rather than results. Such as x+Zx and a-0