(99999+9999+999+99+9)乘1\2
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 05:43:32
![(99999+9999+999+99+9)乘1\2](/uploads/image/z/120466-10-6.jpg?t=%2899999%2B9999%2B999%2B99%2B9%29%E4%B9%981%5C2)
(99999+9999+999+99+9)乘1\2
(99999+9999+999+99+9)乘1\2
(99999+9999+999+99+9)乘1\2
(99999+9999+999+99+9)乘1\2
=(100000+10000+1000+100)/2+5/2
=111100/2+2.5
=55550+2.5
=55552.5
=(100000-1+10000-1+1000-1+100-1+10-1)/2=(111110--5)/2=111105/2