like term點解

An algebraic expression can be divided into several parts by the "+" sign or the "-" sign. Each part is called a term.
Like terms are the terms that contain the same letter(unknown).
e.g. 4x - 2y +7x -------------- > 4x and 7x are like terms (they both have "x")
e.g. 5x2 + 6a2 - 3x + 8x2 ----> 5x2 and 8x2 are like terms (they both have "x2")
* x2 and a2 are unlike terms, also x2 and x are unlike terms.

like term即係d個未知數係一樣,但是個數字唔同,哩d like term

例子:7n^2++4n^2+

錦向例子裡7n^2同4h^2係like term,5h同9h係like term!!!

7n^2係解7n的二次方

2006-10-28 08:22:59 補充：
例子:7n^2+5h+4n^2+9h

e.g. 7n-9n