发布网友 发布时间:2022-05-24 20:28
共2个回答
热心网友 时间:2023-10-31 03:19
第一道题 (125X99+125)X16 =125X(99+1)X16 =25X5X4X4X100 =100X20X100 =200000 第二道题 5X999+5+99X7+7+3X9+3+9 =5X(999+1)+7X(99+1)+3X(9+1)+9 =5000+700+30+9 =5739热心网友 时间:2023-10-31 03:19
(125×99+125)×16 =[125×(99+1)]×16 =[125×1000]×(8×2) =(125×8)×(1000×2) =1000×2000 =2000000 5×999+5+99×7+7+3×9+3+9 =5×(999+1)+7×(99+1)+3×(9+1)+9 =5×1000+7×100+3×10+9 =5000+700+30+9 =5739