1/1*2+1/2*3+1/3*4+1/4*5……+1/2009*2010
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1/1*2+1/2*3+1/3*4+1/4*5……+1/2009*2010
1/n(n+1)【*=乘以 /=分之】
两分钟够了吧
1/n(n+1)【*=乘以 /=分之】
两分钟够了吧
![1/1*2+1/2*3+1/3*4+1/4*5……+1/2009*2010](/uploads/image/z/18878-14-8.jpg?t=1%2F1%2A2%2B1%2F2%2A3%2B1%2F3%2A4%2B1%2F4%2A5%E2%80%A6%E2%80%A6%2B1%2F2009%2A2010)
1/1*2+1/2*3+1/3*4+1/4*5……+1/2009*2010
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/2009-1/2010
=1-1/2010
=2009/2010
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/2009-1/2010
=1-1/2010
=2009/2010
1/1×2+1/2×3+1/4×5+……+1/2009×2010
|1/3+(-1/2)|+|1/4+(-1/3)|+|1/5+(-1/4)|+……+|1/2010+(-1/2009)|
1-2+3-4+5……2009-2010
(1+3+5+…+2009)-(2+4+6…+2010)
计算:-1+2-3+4-5……-2009+2010
1+2+3+4+5+6……+2009+2010
1/1*2+1/2*3+1/3*4+1/4*5……+1/2009*2010
| 1/3 - 1/2 | + | 1/4 - 1/3 | + | 1/5 - 1/4 | …… + | 1/2009
计算:(-1)+(+2)+(-3)+(+4)+(-5)+…+(-2009)+(+2010)
…+2009-2010+2011 1-2+3-4+5-6
(-1)+(+2)+(-3)+(+4)+……+(-2009)+(+2010)等于多少
1+2+3+4……+2008+2009+2010=?