99999/2+9999/2+999/2+99/2+9/2=

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99999/2+9999/2+999/2+99/2+9/2=99999/2+9999/2+999/2+99/2+9/2=99999/2+9999/2+999/2+99/2+9/2=99999/2+99

99999/2+9999/2+999/2+99/2+9/2=
99999/2+9999/2+999/2+99/2+9/2=

99999/2+9999/2+999/2+99/2+9/2=
99999/2+9999/2+999/2+99/2+9/2
=（100000-1）/2+(10000-1)/2+(1000-1)/2+(100-1)/2+(10-1)/2
=50000-1/2+5000-1/2-+500-1/2+50-1/2+5-1/2
=55555-5/2
=55552.5

100000/2+10000/2+1000/2+100/2+10/2-5/2=55552.5

55552.5

99999/2+9999/2+999/2+99/2+9/2=55552.5