1/2*1+1*2*3+1/3*4+………+1/99*100

1/2*1+1*2*3+1/3*4+………+1/99*100 1+2+3+……+99+100 -1-2-3-……-99-100 1×2/1＋2×3/1＋3×4/1……+99×100/1 巧思妙算1/1*2+1/2*3+1/3*4+………………+1/99*98+1又1/99*100巧思妙算 -1-2-2-3-3……-99-99-100 1 2 3 4…… 99 100=？ 计算:(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)+(+101). 1+2+3+4……+99+100 1+(-2)+3+(-4)……+99+(-100)等于? (-1)+(+2)+(-3)+(+4)+(-5)+……+(-99)+(+100)=? (+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)=_____