(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
(-1)×2×(-3)×···×(-49)×50×(-2的5次方) ---------- 2×4×6····×100
计算(+1)+(-2)+(+3)+(-4)+······+(-100)+(+101)+(-102)
1+(-2)+3+(-4)···········+99-100等于多少
根据1+2+3+4+······+n=n(n+1)/2 计算2+4+6+····+200
计算:(1-2)*(2-3)*(3-4)*······*(100-101)
数学题1*2分之一+2*3分之一+3*4分之一+···············+99*100分之一=( )
1×2×3×4······×48×49×50=?
计算:-1+2+(-3)+4+(-5)+······+(-99)+100等于多少?
1、(1+3+5+···+2009+2011)-(2+4+6+···+2010+2012)
1+3+5+···45+47+49+50+51+53+55+···+95+97+99-2-4-6-···-96-98-1
计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50=
(1+3+5+···+997+999)—(2+4+6+···+998+1000)