整式的加减是初中数学的重要内容,是各地中考命题的热点.近年来,对整式加减的考查内容越来越丰富,考查形式也越来越多样.1.结论开放型.例1请你说出单项式5a~2bc~2与3a~3xy的异同点(至少说出2条).解析:数与字母的积叫作单项式,属于整式.可从单项式的系数、次数、所含字母、所含字母的指数等方面进行比较说明.相同点:(1)都是五次单项式;(2)都是整式;(3)都含有字母a;(4)系数都是正整数等.不同点:(1)所含字母不全相同;(2)不是 Integer addition and subtraction is an important part of junior high school mathematics, is a hot topic around the test .In recent years, the addition and subtraction of the whole test contents more and more rich, test forms are more and more diverse. You say the similarities and differences (at least two) of the singles 5a ~ 2bc ~ 2 and 3a ~ 3xy. Analysis: The product of numbers and letters as a monomial, belongs to the whole.From the coefficients of monomials, the number of letters, Contains the letters of the index and other aspects of the comparison shows the same point: (1) are five times the monomial; (2) are the whole; (3) contains the letter a; (4) the coefficients are positive integers, etc. Differences: (1) contains the same letter incomplete; (2) is not