0.11+0.22+0.33+0.44+0.55+0.66+0.77+0.88+0.99巧算

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/25 10:20:43
0.11+0.22+0.33+0.44+0.55+0.66+0.77+0.88+0.99巧算0.11+0.22+0.33+0.44+0.55+0.66+0.77+0.88+0.99巧算0.11+0.2

0.11+0.22+0.33+0.44+0.55+0.66+0.77+0.88+0.99巧算
0.11+0.22+0.33+0.44+0.55+0.66+0.77+0.88+0.99巧算

0.11+0.22+0.33+0.44+0.55+0.66+0.77+0.88+0.99巧算
0.11+0.22+0.33+0.44+0.55+0.66+0.77+0.88+0.99
=(0.11+0.99)+(0.22+0.88)+(0.33+0.77)+(0.44+0.66)+0.55
=1.1+1.1+1.1+1.1+0.55
=1.1×4+0.55
=4.4+0.55
=4.95

0.11*(1+2+3+4.........+9)=0.11*45=4.95

0.11+0.22+0.33+0.44+0.55+0.66+0.77+0.88+0.99
=0.55×9
=4.95