0.025×99902.8×40÷14/5
= 0.025×40×99902.8÷14/5
= 99902.8÷14/5
= 99902.8×5÷14
= 499514÷14
= 249757÷7
= (249753 + 4) ÷ 7
= 35679 + 4/7错了，结果是999你的题目写对了吗?如果你的题目没错，我的答案就没错99902.8？？999*2.8？！题目是：0.025×999×2.8×40÷2又5分之40.025×999×2.8×40÷2又5分之4= (0.025×40)×999×2.8÷(2+4/5)=1 ×999×2.8÷2.8= 999