1.001+2.003+1.005+2.007+1.009+2.001+.+1.197+2.199=

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1.001+2.003+1.005+2.007+1.009+2.001+.+1.197+2.199=
1.001+2.003+1.005+2.007+1.009+2.001+.+1.197+2.199=

1.001+2.003+1.005+2.007+1.009+2.001+.+1.197+2.199=
等于660

1.001x50+0.004x49+2.003x50+0.004x49=150.592

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 =160 400