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1ʮ2ʮ3ʮ4ʮ5ʮ6243ļ㷽

ֱӼȽϳ󣬰һǦʣͼˡ ǦһѷǦʣһǦʣײ243Ǧʣ243㡣Ϳļ㹫ʽˡ 㹫ʽ=ϵ+µף ߡ2 =1+243 243 2 = ...

ʽ=(1ʮ199)ʮ(2ʮ198)ʮ(3ʮ197)ʮʮ100=1/2198200ʮ100=19800ʮ100=19900

ǵȲ ΪһǰһIJͬ ˹ʽĩ2 1 + 2 +3++100 100+99+98++ 1 ÿһ101 һ100 еĺ ٳ2 1+1001002=5050

ǵȲУĺǣ+ĩ2. 1+2+3+...+99 =(1+99)992 =100992 =99002 =4950

nn+1/2 5050 1+99=1002+98=1003+97=100һ49һ٣ټ50ٰǸ100ϣҲ5050

1+99+2+98+3+97+4+96++49+51+50+10049100+50+1004900+50+1004950+1005050

1ʮ2ʮ3ʮ4ʮ5ʮ6һֱӵ1005050 ˼·£ 1+2+3++98+99+100 =1+100+2+99+3+98++50+51 =101+101+101++101 1ӵ100ԷֽΪ 50 101ӡ 10150=5050 չϽ...

1ʮ2ʮ3ʮ4ʮ5ʮ6ʮʮ19ʮ20ü㷽 1ʮ2ʮ3ʮ4ʮ5ʮ6ʮʮ19ʮ20 =(1+20)+(2+19)+....+(10+11) =21*10 =210

ǵȲΪһǰһIJͬ˹ʽĩ2 1 + 2 +3++100 100+99+98++ 1 ÿһ101 һ100еĺٳ2 1+1001002=5050

1ʮ2ʮ3ʮ4ʮ5ʮ6㷨 =1+6+2+5+3+4 =7+7+7 =21

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