1+2+3+4+…+2008+2007+…+4+3+2+1教教我们吧!还有8*2+8*5+8*8+…+8*2000
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 14:27:21
![1+2+3+4+…+2008+2007+…+4+3+2+1教教我们吧!还有8*2+8*5+8*8+…+8*2000](/uploads/image/z/74366-62-6.jpg?t=1%2B2%2B3%2B4%2B%E2%80%A6%2B2008%2B2007%2B%E2%80%A6%2B4%2B3%2B2%2B1%E6%95%99%E6%95%99%E6%88%91%E4%BB%AC%E5%90%A7%EF%BC%81%E8%BF%98%E6%9C%898%2A2%2B8%2A5%2B8%2A8%2B%E2%80%A6%2B8%2A2000)
1+2+3+4+…+2008+2007+…+4+3+2+1教教我们吧!还有8*2+8*5+8*8+…+8*2000
1+2+3+4+…+2008+2007+…+4+3+2+1
教教我们吧!
还有8*2+8*5+8*8+…+8*2000
1+2+3+4+…+2008+2007+…+4+3+2+1教教我们吧!还有8*2+8*5+8*8+…+8*2000
1+2+3+4+…+2008+2007+…+4+3+2+1
=(1+2008)×2008÷2+(1+2007)×2007÷2
=2017036+2015028
=4032064
8×2+8×5+8×8……8×2000
=8×(2+5+8……2000)
=8×667667
=5341336
1+2+3+4+…+2008+2007+…+4+3+2+1
=(2008x2009/2)+(2007x2008/2)
=2017036+2015028
=4032064