計算0.1+0.2+0.3+······+9.8+9.9+10+9.9+9.8+9.7+·········+0.2+0.1

計算0.1+0.2+0.3+······+9.8+9.9+10+9.9+9.8+9.7+·········+0.2+0.1

分兩段算..以10為分界..
(0.1+9.9)*100/2+(0.1+9.9)*100/2+10=1010