39.2+99.2+999.2+9999.2+99999.2 简便计算
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/10 20:11:36
39.2+99.2+999.2+9999.2+99999.2 简便计算
![39.2+99.2+999.2+9999.2+99999.2 简便计算](/uploads/image/z/805956-60-6.jpg?t=39.2%2B99.2%2B999.2%2B9999.2%2B99999.2+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
39.2+99.2+999.2+9999.2+99999.2
=39+0.2+99+0.2+999+0.2+9999+0.2+99999+0.2
=40-1+100-1+1000-1+10000-1+100000-1+1
=111100+40-4
=111136
=39+0.2+99+0.2+999+0.2+9999+0.2+99999+0.2
=40-1+100-1+1000-1+10000-1+100000-1+1
=111100+40-4
=111136