99.9×9.99 简便计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 07:20:23
![99.9×9.99 简便计算](/uploads/image/z/105130-10-0.jpg?t=99.9%C3%979.99+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
99.9×9.99 简便计算
99.9×9.99 简便计算
99.9×9.99 简便计算
99.9×9.99
=(100-0.1)×9.99
=100×9.99-0.1×9.99
=999-0.999
=998.001
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=999*999/1000
=(1000-1)^2 /1000
原式=(100-0.1)×9.99
=100×9.99-0.1×9.99
=999-0.999
=998.001
=(100-0.1)×(10-0.01)=1000-1-1+0.001=998.001