1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19(巧算)

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1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19(巧算)
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1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19(巧算)
1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19(巧算)

1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19(巧算)
=(1.1+19.19)(3.3+17.17)(5.5+15.15).(9.9+11.11)=105