1.001+2.003+1.005+2.007+1.009+2.011+.+1.197+2.199

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1.001+2.003+1.005+2.007+1.009+2.011+.+1.197+2.199
1.001+2.003+1.005+2.007+1.009+2.011+.+1.197+2.199

1.001+2.003+1.005+2.007+1.009+2.011+.+1.197+2.199
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