1.001+2.003+1.005+2.007+1.009+2.011+.+1.197+2.199
问题描述:
1.001+2.003+1.005+2.007+1.009+2.011+.+1.197+2.199
答
共有100个数,整数部分50个1,50个2,
和=50+100+100(0.001+0.199)/2
=150+10
=160