Question

计算1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19

Answer 1

1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19
=1+0.1+3+0.3+5+0.5+7+0.7+9+0.9+11+0.11+13+0.13+15+0.15+17+0.17+19+0.19
=(1+3+5+7+9+11+13+15+17+19)+(0.1+0.3+0.5+0.7+0.9)+(0.1*5+0.01+0.03+0.05+0.07+0.09)
=(1+19)*10/2+(0.1+0.9)*5/2+0.5+(0.01+0.09)*5/2
=100+2.5+0.5+0.25
=103.25

Answer 2

1+3+5+7+9+11+13+15+17+19=100
1+9/3+7/11+19/13+17/5+15/
1+3+5+7+9=25缩小10倍=2.5
11+13+15+17+19=75缩小100倍=0.75
2.5+7.5+100=103.25

Answer 3

真正的是103.25不信你自己算

Answer 4

101