9.75+99.75+999.75+9999.75+1=【简便运算】
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 23:40:57
![9.75+99.75+999.75+9999.75+1=【简便运算】](/uploads/image/z/96973-61-3.jpg?t=9.75%2B99.75%2B999.75%2B9999.75%2B1%3D%E3%80%90%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%E3%80%91)
9.75+99.75+999.75+9999.75+1=【简便运算】
9.75+99.75+999.75+9999.75+1=【简便运算】
9.75+99.75+999.75+9999.75+1=【简便运算】
9.75+99.75+999.75+9999.75+1
=9.75+99.75+999.75+9999.75+0.25x4
=(9.75+0.25)+(99.75+0.25)+(999.75+0.25)+(9999.75+0.25)
=10+100+1000+10000
=11110
9.75+99.75+999.75+9999.75+1
=10-0.25+100-0.25+1000-0.25+10000-0.25+1
=10+100+1000+10000-0.25*4+1
=11110-1+1
=11110