计算0.1+0.2+0.3+···+0.9+0.10+0.11+0.12+0.13+···+0.99
问题描述:
计算0.1+0.2+0.3+···+0.9+0.10+0.11+0.12+0.13+···+0.99
答
(0.1+0.9)*9/2+(0.10+0.99)90/2
=4.5+1.09*45
=53.55