Question

(2-0.1*3)+(4-0.1*5)+(6-0.1*7)+(8-0.1*9)+(10-0.1*11)+(12-0.1*

Answer 1

41.9989898989899

2+4+6+8+10+12=42

0.0010101010101

做减法

我也是这么想的