â n ã 0 ãã 19 ãŸã§ã®æŽæ°ãšããŸããæŽæ°ã®éå A ={a,b,c,d,e,f} ã®éšåéåã®ãã¡ãèŠçŽ æ°ã 3 ã®éšåéå㯠20 åãããŸãããããã®éšåéåã X_n ãšããŸããX_n ã®èŠçŽ ã®ç·åã S_n ãšããŸããS_n = n ãšãªããã㪠A ãæ±ããŠãã ããã
â¡ n ã 1 ãã 20 ãŸã§ã®æŽæ°ãšããŸããæŽæ°ã®éå A ={a,b,c,d,e,f} ã®éšåéåã®ãã¡ãèŠçŽ æ°ã 3 ã®éšåéå㯠20 åãããŸãããããã®éšåéåã X_n ãšããŸããX_n ã®èŠçŽ ã®ç·åã S_n ãšããŸããS_n = n ãšãªããã㪠A ãæ±ããŠãã ããã
=== 8< === 8< === 8< === ãã§ããã³
çæ§ã«ãæç€ºãé æŽãããããã
â¡ã«è§£ããªãããšãã¹ããŒãã«èšŒæã§ãããã®ãªã®ã§ããããïŒ
No.2398Dengan kesaktian Indukmu2024幎12æ17æ¥ 23:45
ç§ã®çè§£ãæ£ãããã°ãmod3ã§èšŒæã§ããŸãã
nã1ïœ20ã®ãšããΣS_n=Σn=210ããa+b+c+d+e+f=21
(a,b,c,d,e,fããããã10åãã€ç»å Žããã®ã§210÷10=21)
以äžéåAã®èŠçŽ ãšåã¯mod3ã§è¡šããŸãã
3ã€ã®åã0ã«ãªããã®ãn=3,6,9,12,15,18ã®6éã
3ã€ã®åã1ã«ãªããã®ãn=1,4,7,10,13,16,19ã®7éã
3ã€ã®åã2ã«ãªããã®ãn=2,5,8,11,14,17,20ã®7éã
A={x,x,x,x,y,z} (x,y,zã¯ãããã0ã1ã2) ã®å Žå
2x+yã6éãã2x+zã6éãã3xã4éããx+y+zã4éã
ãã®ãšã0,1,2ãå¶æ°åãã€ã«ãããªããªãã®ã§äžé©
ãã£ãŠmod3ãäžèŽãããã®ã¯3å以äž
Aã®èŠçŽ ã§0ã3åã®ãšããç·åã0(21â¡0)ãªã®ã§
(0,0,0,1,1,1)ã(0,0,0,2,2,2)ã®ããããã
ãããã©ã¡ãã®å Žåã0ã«ãªããã®ã
2éã((0,0,0)ãš(1,1,1)ãŸãã¯(2,2,2))ãããªãäžé©ã
# ãããã®å Žåã1ã«ãªããã®ãš2ã«ãªããã®ããããã9éããã€ã§ãã
Aã®èŠçŽ ã§0ã2åã®ãšããç·åã0ãªã®ã§(0,0,1,1,2,2)
ãã®ãšã0ã«ãªããã®ã(0,1,2)ã®çµåã2Ã2Ã2=8éããšãªãäžé©ã
# 1ã«ãªããã®ã¯(0,0,1)ã2éãã(0,2,2)ã2éãã(1,1,2)ã2éãã®èš6éã
# 2ã«ãªããã®ã¯(0,0,2)ã2éãã(0,1,1)ã2éãã(1,2,2)ã2éãã®èš6éã
Aã®èŠçŽ ã§0ã1åã®ãšããç·åã0ã«ãªããã®ã¯
(0,1,1,1,1,2)ã(0,1,2,2,2,2)ãããªãã
åããã®ã4å以äžã«ãªãã®ã§äžé©ã
Aã®èŠçŽ ã§0ã0åã®ãšããç·åã0ã§åããã®ã3å以äžãªã®ã§(1,1,1,2,2,2)
ãã®ãšã0ã«ãªããã®ã(1,1,1)ãš(2,2,2)ã®2éããšãªãäžé©ã
åŸã£ãŠè§£ã¯ååšããŸããã
ã¡ãªã¿ã«n=0ïœ19ã®å Žåã¯ãäžèšãšå
šãåãæé ã§èãããš
(0,0,0,1,1,2), (0,0,1,2,2,2), (0,1,1,1,2,2)
ã®3éããæ¡ä»¶ãæºãããŸãã
# æ¡ä»¶ã¯ç·åã190÷10=19â¡1ã3ã€ã®åã0,1,2ã«ãªããã®ãé ã«7,7,6éã
# è§£ã®ååšèšŒæã§ã¯ãããŸãã
No.2399ãããã2024幎12æ18æ¥ 03:10
ããããããããŸããšã«æé£ãããããŸãã
ãªãã»ã© mod 3 ã§ïŒïŒããŠãã³ãç®ãããããããšã
ãä»èšïŒã
â ã®è§£ãšããŠ
a=â5,âb=2,âc=3,âd=4,âe=6,âf=9
ããããŸãã
ããããã¯ããã²ãšã€ã ããšåããŸãã
ãä»èšïŒã
â¡ããããããŠããŠ
äžèšãŸã§ã§æ«æããŸããããç¬ããã ããã
a+b+c = 1
d+e+f = 20
a †b †c †d †e †f
å®ã¯
a < b < c < d < e < f
ã§ããããªããšãªãã°ãããšãã°é¡æãã
a+b+c < a+b+d
ãšãªããã°ãªãããä»ã®çµã¿åããã©ããã§ãåæ§ã ããã§ããã
âè£é¡ïŒ
d †5
蚌æ
6 †d ãšä»®å®ããã
ãããš d < e < f ãã
7 †e
8 †f
ããã«
21 †d+e+f
ãåŸãã
ãã㯠d+e+f = 20 ãšççŸããã
èçæ³ã«ããè£é¡ïŒ
d †5 ã蚌æãããã
âè£é¡ïŒ
c †4
b †3
蚌æ
b < c < d †5
ããæãã
âè£é¡ïŒ
-6 †a
蚌æ
c †4 ,b †3 ãã
b+c †7
a+b+c = 1 ã§ãããã
1 -a = b+c †7
-6 †a
âè£é¡ïŒ
d = c +1
蚌æ
ïŒã€ã®ç·åãæå€§ã®ãã®ã¯
d + e +f
ïŒçªç®ã«å€§ãããã®ã¯
c +e +f
åè
㯠20 ,åŸè
㯠19
ããã«
d = c +1
ããããå
šæ°ããããããã°ã©ã ã§ãäœããããšæã£ãŠããã®ã§ãâŠâŠãšã»ã»
No.2400Dengan kesaktian Indukmu2024幎12æ18æ¥ 09:30
ç¶ããæäœæ¥ã§èšŒæããŠã¿ãŸããã
a+b+c=1ããcâ§2 (âµcâŠ1ãªãã°a+b+cïŒ1)
ãã£ãŠc=2,3,4
3çªç®ã«å€§ãããã®ã¯
b+e+f ãŸã㯠c+d+f
3çªç®ã«å€§ãããã®ãb+e+fã§ããå Žå
b+1=c,c+1=d,1-b-c=aãªã®ã§
(a,b,c,d)=(-2,1,2,3),(-4,2,3,4),(-6,3,4,5)
(a,b,c,d)=(-2,1,2,3)ã®å Žå
1+2+3=6ãªã®ã§1ïœ5ã«-2ã䜿ãããã
-2,1,2,3ã§4ã¯äœããªãããã4-(-2)-2=4ãŸãã¯4-(-2)-1=5ã®ãããããå¿
èŠã
fâ§8ãªã®ã§4ã5ã«ãªãã®ã¯eã
e=4ã®ãšã(-2)+1+4=(-2)+2+3=3ãšãªãäžé©ã
e=5ã®ãšã(-2)+3+5=1+2+3=6ãšãªãäžé©ã
ãã£ãŠ(a,b,c,d)=(-2,1,2,3)ã¯äžé©ã
(a,b,c,d)=(-4,2,3,4)ã®å Žå
2+3+4=9ãªã®ã§1ïœ8ã«-4ã䜿ãããã
-4,2,3,4ã§4ã¯äœããªãããã4-(-4)-3=5ãŸãã¯4-(-4)-2=6ã®ãããããå¿
èŠã
fâ§8ãªã®ã§5ã6ã«ãªãã®ã¯eã
e=5ã®ãšã(-4)+2+5=(-4)+3+4=3ãšãªãäžé©ã
e=6ã®ãšãd+e+f=20ãªã®ã§f=10ãšãªãã(-4)+3+10=2+3+4=9ãšãªãäžé©ã
ãã£ãŠ(a,b,c,d)=(-4,2,3,4)ã¯äžé©ã
(a,b,c,d)=(-6,3,4,5)ã®å Žå
3+4+5=12ãªã®ã§1ïœ11ãäœãã®ã«-6ã䜿ããªããã°ãªããªããã
-6ã䜿ããã®ã¯ã¡ããã©10åãªã®ã§äžé©ã
ãã£ãŠ(a,b,c,d)=(-6,3,4,5)ãäžé©ãªã®ã§
ã3çªç®ã«å€§ãããã®ãb+e+fãã¯äžé©ã
3çªç®ã«å€§ãããã®ãc+d+fã§ããå Žå
c+1=d,d+1=e,20-d-e=fãªã®ã§
(c,d,e,f)=(2,3,4,13),(3,4,5,11),(4,5,6,9)
(c,d,e,f)=(2,3,4,13)ã®å Žå
2+3+4=9ãªã®ã§10ïœ20ãäœãã®ã«13ã䜿ããªããã°ãªããªããã
13ã䜿ããã®ã¯ã¡ããã©10åãªã®ã§äžé©ã
(c,d,e,f)=(3,4,5,11)ã®å Žå
3+4+5=12ãªã®ã§13ïœ20ã«11ã䜿ãããã
3,4,5,11ã§17ã¯äœããªãããã17-11-5=1ãŸãã¯17-11-4=2ã®ãããããå¿
èŠã
aïŒ0ãªã®ã§1ã2ã«ãªãã®ã¯bïŒâµaâ§0ã®ãšãa+b+câ§3ïŒã
b=1ã®ãšããa+b+c=1ãªã®ã§a=-3ãšãªãã-3+4+11=3+4+5=12ãšãªãäžé©ã
b=2ã®ãšãã2+5+11=3+4+11=18ãšãªãäžé©ã
ãã£ãŠ(c,d,e,f)=(3,4,5,11)ã¯äžé©ã
(c,d,e,f)=(4,5,6,9)ã®å Žå
4+5+6=15ãªã®ã§16ïœ20ã«9ã䜿ãããã
4,5,6,9ã§17ã¯äœããªãããã17-9-6=2ãŸãã¯17-9-5=3ã®ãããããå¿
èŠã
äžãšåæ§ã«2ã3ã«ãªãã®ã¯bã
b=2ã®ãšã2+4+9=4+5+6=15ãšãªãäžé©ã
b=3ã®ãšã3+6+9=4+5+9=18ãšãªãäžé©ã
ãã£ãŠ(c,d,e,f)=(4,5,6,9)ãäžé©ãªã®ã§ã
ã3çªç®ã«å€§ãããã®ãc+d+fãã¯äžé©ã
以äžã«ãããè§£ãªãã
No.2402ãããã2024幎12æ18æ¥ 11:57
ããããçŽ æŽãããã§ãïŒ
No.2403Dengan kesaktian Indukmu2024幎12æ18æ¥ 21:53
n=0ïœ19ã«åãèšŒææ¹æ³ãé©çšããã°å
šè§£ãåŸãããã¯ããªã®ã§
ãã£ãŠã¿ãããªããŸããã
ããã°ã©ã ã«ããç·åœããã§è§£ã¯(-5,2,3,4,6,9)ã®äžã€ãšããã£ãŠããŸãã®ã§ã
çµæãåãã°å
容ã確èªããŠããã ãå¿
èŠã¯ãããŸããã
ãã ã®èœæžããšããŠã¹ã«ãŒããŠäžããã
n=0ïœ19ã®ãšãaïŒbïŒcïŒdïŒeïŒfãšããŠ
a+b+c=0
d+e+f=19
d=c+1
-7âŠaâŠ-1
-1âŠbâŠ3
1âŠcâŠ4
2âŠdâŠ5
3âŠeâŠ8
8âŠfâŠ14
(ãããŸã§èšŒæçç¥)
c=1ã®ãšã(a,b,c,d)=(-1,0,1,2)ãšãªããã
ãã®ãšãa+d+e=b+c+eãšãªãäžé©ã
ãã£ãŠ2âŠcâŠ4, 3âŠdâŠ5, 4âŠeâŠ8, 8âŠfâŠ12ã
3çªç®ã«å€§ãããã®ã¯b+e+fãŸãã¯c+d+f
3çªç®ã«å€§ãããã®ãb+e+fã§ããå Žå
b+1=c, c+1=d, a+b+c=0ãªã®ã§
(a,b,c,d)=(-3,1,2,3),(-5,2,3,4),(-7,3,4,5)
(a,b,c,d)=(-3,1,2,3)ã®å Žå
1+2+3=6ãªã®ã§0ïœ5ã«-3ã䜿ãããã
-3,1,2,3ã§3ã¯äœããªãããã3-(-3)-2=4ãŸãã¯3-(-3)-1=5ã®ãããããå¿
èŠã
fâ§8ãªã®ã§4ã5ã«ãªãã®ã¯eã
e=4ã®ãšã(-3)+1+4=(-3)+2+3=2ãšãªãäžé©ã
e=5ã®ãšãf=19-5-3=11ãšãªãã(-3)+1+11=1+3+5=9ãšãªãäžé©ã
ãã£ãŠ(a,b,c,d)=(-3,1,2,3)ã¯äžé©ã
(a,b,c,d)=(-5,2,3,4)ã®å Žå
2+3+4=9ãªã®ã§0ïœ8ã«-5ã䜿ãããã
-5,2,3,4ã§3ã¯äœããªãããã3-(-5)-3=5ãŸãã¯3-(-5)-2=6ãå¿
èŠã
fâ§8ãªã®ã§5ã6ã«ãªãã®ã¯eã
e=5ã®ãšã(-5)+2+5=(-5)+3+4=2ãšãªãäžé©ã
e=6ã®ãšãf=19-6-4=9ãšãªããã(a,b,c,d,e,f)=(-5,2,3,4,6,9)ã¯
(-5)+2+3=0, (-5)+2+4=1, (-5)+3+4=2, (-5)+2+6=3, (-5)+3+6=4, (-5)+4+6=5,
(-5)+2+9=6, (-5)+3+9=7, (-5)+4+9=8, 2+3+4=9, (-5)+6+9=10, 2+3+6=11, 2+4+6=12,
3+4+6=13, 2+3+9=14, 2+4+9=15, 3+4+9=16, 2+6+9=17, 3+6+9=18, 4+6+9=19 ãšãªãé©ã
ãã£ãŠ(a,b,c,d)=(-5,2,3,4)ã®ãšãã®è§£ã¯(a,b,c,d,e,f)=(-5,2,3,4,6,9)
(a,b,c,d)=(-7,3,4,5)ã®å Žå
3+4+5=12ãªã®ã§0ïœ11ã«-7ã䜿ãããããšã«ãªããã-7ã䜿ãããã®ã¯10åãªã®ã§äžé©ã
åŸã£ãŠã3çªç®ã«å€§ãããã®ãb+e+fãã®ãšãã«è§£ãäžã€åŸãããã
3çªç®ã«å€§ãããã®ãc+d+fã§ããå Žå
c+1=d, d+1=e, d+e+f=19ãªã®ã§
(c,d,e,f)=(2,3,4,12),(3,4,5,10),(4,5,6,8)
(c,d,e,f)=(2,3,4,12)ã®å Žå
2+3+4=9ãªã®ã§10ïœ19ã«12ã䜿ãããã
2,3,4,12ã§16ã¯äœããªãããã16-12-4=0ãŸãã¯16-12-3=1ã®ãããããå¿
èŠã
aâŠ-1ãªã®ã§0ã1ã«ãªãã®ã¯bã
b=0ã®ãšãa=0-0-2=-2ãšãªãã(-2)+3+4=0+2+3=5ãšãªãäžé©ã
b=1ã®ãšã1+4+12=2+3+12=17ãšãªãäžé©ã
ãã£ãŠ(c,d,e,f)=(2,3,4,12)ã¯äžé©ã
(c,d,e,f)=(3,4,5,10)ã®å Žå
3+4+5=12ãªã®ã§13ïœ19ã«10ã䜿ãããã
3,4,5,10ã§16ã¯äœããªãããã16-10-5=1ãŸãã¯16-10-4=2ã®ãããããå¿
èŠã
aâŠ-1ãªã®ã§1ã2ã«ãªãã®ã¯bã
b=1ã®ãšãa=0-1-3=-4ãšãªãã(-4)+3+10=1+3+5=9ãšãªãäžé©ã
b=2ã®ãšã2+5+10=3+4+10=17ãšãªãäžé©ã
ãã£ãŠ(c,d,e,f)=(3,4,5,10)ã¯äžé©ã
(c,d,e,f)=(4,5,6,8)ã®å Žå
4+5+6=15ãªã®ã§16ïœ19ã«8ã䜿ãããã
4,5,6,8ã§16ã¯äœããªãããã16-8-6=2ãŸãã¯16-8-5=3ã®ãããããå¿
èŠã
aâŠ-1ãªã®ã§2ã3ã«ãªãã®ã¯bã
b=2ã®ãšã2+5+8=4+5+6=15ãšãªãäžé©ã
b=3ã®ãšã3+6+8=4+5+8=17ãšãªãäžé©ã
ãã£ãŠ(c,d,e,f)=(4,5,6,8)ã¯äžé©ãªã®ã§ã
ã3çªç®ã«å€§ãããã®ãc+d+fãã¯äžé©ã
åŸã£ãŠæ¡ä»¶ãæºããè§£ã¯(a,b,c,d,e,f)=(-5,2,3,4,6,9)ã®ã¿ã
No.2404ãããã2024幎12æ19æ¥ 06:31
ããã« n=2ïœ21 ã n=3ïœ22 ãªã©ã®ããã«ç¯å²ãå€ãããšã©ããªããã
èããã®ã§ããã0ïœ19ãš1ïœ20ã®å Žåãããã¹ãŠå°ããŸããã
ãŸãa,b,c,d,e,fãã¹ãŠã«1ãè¶³ãã°3ã€ã®åã¯3倧ãããªããŸãã®ã§
n=0ïœ19ã§è§£ãããããšããn=3ïœ22, 6ïœ25, 9ïœ28, âŠã§ã
+1,+2,+3,âŠããå¯äžè§£ãååšããããšãããããŸãã
åæ§ã«ãn=1ïœ20ã§è§£ããªãããšããn=4ïœ23, 7ïœ26, 10ïœ29, âŠã§ã
è§£ããªãããšãããããŸãã
ãããŠn=2ïœ21ã®å Žåã¯
n=0ïœ19ã®ãšãã®a,b,c,d,e,fãå
šéš7ããåŒããŠ
7-f,7-e,7-d,7-c,7-b,7-aããããããŠa,b,c,d,e,fãšãããš
3æ°ã®åã¯21ããåŒãããã®ã«ãªã2ïœ21ãäœããŸãã
ãã£ãŠn=2ïœ21ã®ãšãã®å¯äžè§£ã¯
(a,b,c,d,e,f)=(7-9,7-6,7-4,7-3,7-2,7-(-5))=(-2,1,3,4,5,12)
ãšããããäžãšåæ§ã«n=5ïœ24, 8ïœ27, 11ïœ30, âŠã§ã¯
ããããã«+1,+2,+3âŠããè§£ãååšããŸãã
åŸã£ãŠn=tïœt+19ã®ãšãã®äžè¬è§£ã¯
t=3kã®ãšã (a,b,c,d,e,f)=(-5+k, 2+k, 3+k, 4+k, 6+k, 9+k)
t=3k+1ã®ãšã è§£ãªã
t=3k+2ã®ãšã (a,b,c,d,e,f)=(-2+k, 1+k, 3+k, 4+k, 5+k, 12+k)
(kã¯è² ã§ãOK)
ãšããããŸããã
No.2405ãããã2024幎12æ19æ¥ 07:21
ããããããããããããšå匷ã«ãªããŸãïŒ
ãn=0ïœ19ã®ãšãã®a,b,c,d,e,fãå
šéš7ããåŒããŠãâå£ããããããšãããŸããïŒïŒïŒ
No.2407Dengan kesaktian Indukmu2024幎12æ19æ¥ 13:03
1ã20ã§è§£ããªãããšã®è¶
ã¹ãããªãã蚌æãã§ããŸããã
Σ (S_n)^2 = 10*(a^2+b^2+âŠâŠf^2) + 8*(ab+ac+âŠâŠ+ef)
ããªãã¡
2870 = (a+b+c+d+e+f)^2 + 9*(a^2+b^2+âŠâŠf^2) + 6*(ab+ac+âŠâŠ+ef)
巊蟺ã3ã§å²ã£ãäœãã¯2ãå³èŸºã3ã§å²ã£ãäœãã¯0ã1ãªã®ã§ãæ¡ä»¶ãæºããæ°ã¯ååšããªãã
No.2411DD++2024幎12æ21æ¥ 08:35
DD++ ããã«ããé®®ãããªç蚌æãæèŠããŠææ¿ããŠãããŸãã
2870 = (a+b+c+d+e+f)^2 + 9*(a^2+b^2+âŠâŠf^2) + 6*(ab+ac+âŠâŠ+ef)
ã®ãšããã§ a+b+c+d+e+f = 21 ã代å
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No.2412Dengan kesaktian Indukmu2024幎12æ21æ¥ 14:46
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