(+1)+(-2)+(3)+(-4)·····(+99)+(-100)
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(+1)+(-2)+(3)+(-4)·····(+99)+(-100)
(+1)+(-2)+(3)+(-4)·····(+99)+(-100)
(+1)+(-2)+(3)+(-4)·····(+99)+(-100)
-50
-50
-50
计算(+1)+(-2)+(+3)+(-4)+······+(-100)+(+101)+(-102)
(1994+1992+······+4+2)—(1+3+5+······+1991+1993)=( )
(+1)+(-2)+(3)+(-4)·····(+99)+(-100)
(-1)+2+(-3)+4+······+(-2009)+2010+(-2011)=________________________(注意:
(1+3+5++7+9······+2011)-(2+4+6+8······+2012)=
(1+3+5+······2013)—(2+4+6······+2014)用简便方法哦,这是奥数题.
(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
2[4/3y—(2/3y—1/2)]=3/4y急·································!1
1+2+3+4+5+······+9999=( ) 急用
1+2+3+4+5+······+100(用简便算法)
1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+······+1/(1+2+3+······+200)=?
(1-2)(2-3)(3-4)(4-5)····(2003-2004) 咋算
1+(-2)+3+(-4)···········+99-100等于多少
较难的奥数计算题1、(1-1/2*4)*(1-3/3*5)*(1-5/4*6)·····(1-13/9*11)2、((1+2)/2)*((1+2+3)/2+3)····*((1+2+3+···+2001)/2+3+···2001)
计算:-1+2+(-3)+4+(-5)+······+(-99)+100等于多少?
计算:1+(-2)+3+(-4)+···+2005+(-2006)+2007+(-2008).
简算:1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+······+1/(39*40) = 急
根据1+2+3+4+······+n=n(n+1)/2 计算2+4+6+····+200