僩僢僾儁乕僕
佀
math
1001僐儊儞僩
297KB
亂sin亃崅峑惗偺偨傔偺悢妛偺幙栤僗儗PART30亂cos亃
慡晹
慜100
師100
嵟怴50
仭 偙偺僗儗僢僪偼夁嫀儘僌憅屔偵奿擺偝傟偰偄傑偡
0413
侾俁俀恖栚偺慺悢偝傫
2005/06/22(悈) 23:24:25
n偑帺慠悢偺偲偒丄師偺摍幃傪悢妛揑婣擺朄偱徹柧偣傛丅
1+2+3+ゥ�+n(n+1)(n+2)=(1/4)n(n+1)(n+2)(n+3)
偍婅偄偟傑偡丅
慡晹
慜100
師100
嵟怴50
仭 偙偺僗儗僢僪偼夁嫀儘僌憅屔偵奿擺偝傟偰偄傑偡