1. Calculate 100 × 99-99 × 98 + 98 × 97-97 × 96 + ＋4×3－3×2＋2×1＝（ ）. 2. Xiaoqiang takes part in the "2010 Chen Shengshen mathematics week" activity from the walking path examination room at home. If he walks 50 meters per minute, he will be late To 3 minutes, if you walk 60 meters per minute, you can get to the examination room 2 minutes in advance. So the distance from Xiaoqiang's home to school It's () meters

1. Calculate 100 × 99-99 × 98 + 98 × 97-97 × 96 + ＋4×3－3×2＋2×1＝（ ）. 2. Xiaoqiang takes part in the "2010 Chen Shengshen mathematics week" activity from the walking path examination room at home. If he walks 50 meters per minute, he will be late To 3 minutes, if you walk 60 meters per minute, you can get to the examination room 2 minutes in advance. So the distance from Xiaoqiang's home to school It's () meters

1. The original formula is (100 × 99-99 × 98) + (98 × 97-97 × 96) + (96 × 95-95 × 94) + (4 × 3-3 × 2) + 2 × 1 = 99 * 2 + 97 * 2 +... + 3 * 2 + 1 * 2 = 2 * (99 + 97 +... + 3 + 1) = 5000; 2. If the number of minutes is x, then 50 × (x + 3) = 60 × (X-2), x = 27, the distance is 50 × (27 + 3)