1/2+1+1(1/2)+2+2(1/2)…+49(1/2)+50
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![1/2+1+1(1/2)+2+2(1/2)…+49(1/2)+50](/uploads/image/z/5431078-46-8.jpg?t=1%2F2%2B1%2B1%281%2F2%29%2B2%2B2%281%2F2%29%E2%80%A6%2B49%281%2F2%29%2B50)
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1/2+1+1(1/2)+2+2(1/2)…+49(1/2)+50
1/2+1+1(1/2)+2+2(1/2)…+49(1/2)+50
1/2+1+1(1/2)+2+2(1/2)…+49(1/2)+50
(0.5+50)*100/2=2525
(首项+末项)*项数/2
高斯算法