1/(1*2)+1/(2*3)+1/(3*4)+……+1/(98*99)+1/99*100
奥数题1/1×2×3+1/2×3×4+……+1/98×99×100
1×2×1/3+2×3×1/4+……98×99×1/100=?
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
(100+98+96+……+4+2)-(99+97+95+……+3+1)
1/(1*2)+1/(2*3)+1*(3*4)+1/(4*5)……1/(98*99)+1/(99+100)=?
1/1×2+1/2×3+1/3×4+1/4×5+……+1/98×99+1/99×100=()简算
1×2/1+2×3/1+3×4/1+…+98×99/1+99×100/1 用简便方法计算
1/1*2+1/2*3+1/3*4+…1/98*99+1/99*100如何解答?
1/1*2*3+1/2*3*4+…+1/98*99*100
1/1*2*3+1/2*3*4+1/3*4*4+……1/98*99*100
计算:1-100+2-99+3-98+…+98-3+99-2+100-1
1×2×3×……×98×99×100等于多少?