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1ʮ2ʮ3ʮ4ʮ5ʮ6243ļ㷽

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

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

1+2+3+4+..............+365=66795 㷽 365-n+n+1=365-n+1+n=365+1=364+2=363+3=........=366 У365-1/2 =182ԡ366x182=66612 мǣ365-1/2 +1=183 ԣ365ӣǣ183+66612=66795

õȲе͹ʽ ԭʽ=1+50502 =5125 =1275 Ȳdzеһ֣һдӵڶÿһǰһIJͬһоͽȲУȲеĹĸdʾ ...

ΪһȲУȲӵķŶ1ĩĺͳٳ22м32ĩĺ͡

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

1ʮ2ʮ3ʮ4ʮ5ʮ6365 =1+365x3652 =366x3652 =66795

S=n(a1+an)/2=100(1+100)/2=5050 Ȳе͹ʽʹεʽǣ(ϵ+µ)ߡ2

͹ʽ =һ+ĩһָ/2 ˸֪ ǸȲ

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...

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