mn-m的3次方n-mn的3次方+2m的平方n的平方
=mn(1-m^2-n^2+2mn)
=mn[1-(m-n)^2]
=mn(1-m+n)(1+m-n)
猜你喜欢
- 1有五个连续的偶数的和130,这五个连续偶数分别是多少?
- 2My life will be ( )better than it is.A .a lot B .a lot of C.a few D.more
- 3有梨和苹果若干个,梨的个数是全体的5/3少27个,苹果的个数是全体的7/4少31个,那么梨和苹果共多少个?
- 4“立德、敬业、博学、竞先”译成英文,
- 5你们在聚会上感觉如何?用英文怎么翻译
- 6寻找词语来形容这个人..
- 7计算从0到π的定积分∫[x/(4+sin²x)]dx
- 8Fill in the blanks with the proper form of the given words.
- 9英语句子:What will travelling in our city be like in 10years’time什么意思
- 10My grandmother's 80th birthday is( )