这两道题怎么简便做
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/01 02:28:10
这两道题怎么简便做
![](http://img.wesiedu.com/upload/4/29/429ef7838fd0387536f2bbbba0d33504.jpg)
![](http://img.wesiedu.com/upload/4/29/429ef7838fd0387536f2bbbba0d33504.jpg)
![这两道题怎么简便做](/uploads/image/z/4822428-12-8.jpg?t=%E8%BF%99%E4%B8%A4%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E7%AE%80%E4%BE%BF%E5%81%9A)
(1)分子=2002*(2002-1)+1=2002*2001+1
分母=2002*(2002-2001)+2001*2001
=2002+2001*2001
=(2001+1)+2001*2001
=2001+2001*2001+1
=2001(1+2001)+1
=2002*2001+1
所以等于1
(2)999×222+333×334
=333×3×222+333×334
=333×666+333×334
=333×(666+334)
=333×1000
=333000
分母=2002*(2002-2001)+2001*2001
=2002+2001*2001
=(2001+1)+2001*2001
=2001+2001*2001+1
=2001(1+2001)+1
=2002*2001+1
所以等于1
(2)999×222+333×334
=333×3×222+333×334
=333×666+333×334
=333×(666+334)
=333×1000
=333000