2/1*3+2/3*5+2/5*7……+2/97*99+2/99*101
2/1*3+2/3*5+2/5*7……+2/97*99+2/99*101
1-2+3-4+5-6+7-……+97-98+99-100+101怎么算
2/1*3+2/3*5+2/5*7+.+2/97*99=2/99*101
2×2/1×3+4×4/3×5+6×6/5×7+……+98×98/97×99+100×100/99×101
1×2/1+2×3/1+3×5/1+5×7/1﹢…﹢97×99/1+99×101/1简算
3×5/2+5×7/2+7×9/2+……+99×101/2 简便运算
1/3*2/5+1/5*2/7+ 1/7*2/9+……+1/99*2/101
1/3 × 2/5+1/5 2/7+1/7 2/9+……1/99 × 2/101
找规律计算2/1*3+2/3*5+2/5*7+.+2/97*99+2/99*101
找规律计算2/〈1*3]+2/[3*5]+2/[5*7]+.+2/[97*99]+2/[99*101]
1.1/1*2+1/2*3+1/3*4+……+1/99*100 2.2/1*3+2/3*5+2/5*7+……+2/97*
(1+2/3+2+3/4+3+4/5+……+97+98/99+98+99/100)/(3+1/3+5+2/4+7+3/5