0.1+0.2+0.3.+0.99+0.100等于多少

问题描述:

0.1+0.2+0.3.+0.99+0.100等于多少

(1+2+3+....+9)/10+(10+11+12+...+99)/100+0.1
=4.5+49.05+0.1
=53.65

0.1+0.2+0.3......+0.9+1.0=5.5

居然做错了

0.1+0.2+0.3......+0.99+0.100=49.6
0.1+0.2+0.3......+0.99+1.00=50.5

0.1+0.2+0.3+…+0.99+0.100
=(0.1+0.2+…+0.9)+(0.10+0.11+0.12+…+0.99)+0.100
=(0.1+0.9)×9÷2+(0.10+0.99)×90÷2+0.100
=4.5+49.05+0.1
=53.65