巧算题求解1991+199.1+19.91+1.991
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 16:32:37
![巧算题求解1991+199.1+19.91+1.991](/uploads/image/z/5421158-62-8.jpg?t=%E5%B7%A7%E7%AE%97%E9%A2%98%E6%B1%82%E8%A7%A31991%2B199.1%2B19.91%2B1.991)
x){}u_.lcӋ
--
"6IE*b8ِbkjXj聰0+5]C!L/.H̳ZlhX,-q Y
巧算题求解1991+199.1+19.91+1.991
巧算题求解
1991+199.1+19.91+1.991
巧算题求解1991+199.1+19.91+1.991
2000+200+20+2-(9+0.9+0.09+0.009)
=2222-10+0.001
=2212.001
(2000+200+20+2)-(9+0.9+0.09+0.009)
=2222-9.999
=2212.001