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No.1438管çè
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No.1467管çè
2023幎10æ9æ¥ 00:33 ããïŒ
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2023幎10æ9æ¥ 01:51 管ç人æ§
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No.1478ããããã¯ã¡ã¹ã2023幎10æ10æ¥ 08:31 èŠåã®çºèŠ3ã®åé¡.1
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f(1,2)=3,f(2,3)=8,f(3,4)=15ã®ãšãf(4,5)ãããšããã
1.3ã€ã®åŒãäžããããŠããã®ã§ãf(x,y)=ax^2+bx+cyãšãããšã
f(1,2)= a+ b+2c-----(1)
f(2,3)=4a+2b+3c-----(2)
f(3,4)=9a+3b+4c-----(3)
(1)(2)(3)ããã
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f(1,2)= a+4b+2c-----(4)
f(2,3)=2a+9b+3c-----(5)
f(3,4)=3a+16b+4c----(6)
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No.1479ããããã¯ã¡ã¹ã2023幎10æ10æ¥ 12:47
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1.f(x,y)=ax^2+bx+cy^2+dyã
2.f(x,y)=ax^3+bx^2+cx+dyã
3.f(x,y)=ax+by^3+cy^2+dyã
4.f(x,y)=ax^2+bx+cy+dã
5.f(x,y)=ax+by^2+cy+dã
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1.f(x,y)=ax^2+bx+cy^2+dyã
f(1,6)= a+ b+36c+6d-----(1)
f(2,4)=4a+2b+16c+4d-----(2)
f(3,5)=9a+3b+25c+5d-----(3)
f(4,6)=16a+4b+36c+6d----(4)
(1)(2)(3)(4)ããã
a=61/14,b=-319/14,c=-47/14,d=339/14
ãããf(3,6)=- 33/7
2.f(x,y)=ax^3+bx^2+cx+dyã
f(1,6)= a+ b+ c+6d------(5)
f(2,4)=8a+4b+2c+4d------(6)
f(3,5)=27a+9b+3c+5d-----(7)
f(4,6)=64a+16b+4c+6d----(8)
(5)(6)(7)(8)ããã
a=47/14,b=-395/7,c=-240/7,d=-37/14
ãããf(3,6)=-7503/14
3.f(x,y)=ax+by^3+cy^2+dyã
f(1,6)= a+216b+36c+6d----(9)
f(2,4)=2a+64b+16c+4d-----(10)
f(3,5)3a+125b+25c+5d-----(11)
f(4,6)=4a+216b+36c+6d----(12)
(9)(10)(11)(12)ããã
a=-1,b=61/120,c=-53/8,d=1357/60
ãããf(3,6)=4âå¯äžæ£è§£
4.f(x,y)=ax^2+bx+cy+dã
f(1,6)= a+ b+6c+ d------(13)
f(2,4)=4a+2b+4c+ d-------(14)
f(3,5)=9a+3b+5c+ d------(15)
f(4,6)16a+4b+6c+ d------(16)
(13)(14)(15)(16)ããã
a=1,b=-6,c=-6,d=47
ãããf(3,6)=2
5.f(x,y)=ax+by^2+cy+dã
f(1,6)= a+36b+6c+ d------(17)
f(2,4)=2a+16b+4c+ d------(18)
f(3,5)=3a+25b+2c+ d------(19)
f(4,6)=4a+36b+6c+ d------(20)
(17)(18)(19)(20)ããã
a=-1,b=-1,c=-15,d=61
ãããf(3,6)=-68
No.1480ããããã¯ã¡ã¹ã2023幎10æ10æ¥ 16:31
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u,v,w,x,y,z â R ,
u+v+w=x+y+z â uv+vw+wu-x^2-y^2-z^2+2(xy+yz+zx-ux-vy-wz)âŠ0 .
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A=((1,-1/2,-1/2),(-1/2,1,-1/2),(-1/2,-1/2,1)) ,
t(b)=(1,1,1) ,
P=((u,z,y),(z,v,x),(y,x,w)) .
No.1451ããã²ã2023幎10æ3æ¥ 19:05
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(1) A ã察è§è¡åã§ a[3,3] = 0 ã®å Žå
A = diag( λ[1], λ[2], 0 ) ãšããŸãã
A ã¯ã©ã³ã¯2ã§æ£å®å€ãªã®ã§ãλ[1] 㚠λ[2] ã¯æ£ã®æ°ã§ãã
ãã®ãšãä»®å®ã¯ λ[1]*p[1,1] + λ[2]*p[2,2] = 0 ãšãªããå€åœ¢ãããšã
2*λ[1]*λ[2]*p[1,1]*p[2,2] = - (λ[1]*p[1,1])^2 - (λ[2]*p[2,2])^2 ⊠0
2*λ[1]*λ[2] ã¯æ£ãªã®ã§ãp[1,1]*p[2,2] ⊠0 ãšãªããŸãã
ãŸããb = t( 0, 0, ±1 ) ãããt(b)*adj(P)*b ã¯åçŽã« adj(P) ã® [3,3] æåãæå³ããã®ã§ã
t(b)*adj(P)*b = p[1,1]*p[2,2] - p[1,2]^2 ⊠0
ãšãªããŸãã
çå·æç«ã¯ p[1,1] = p[2,2] = p[1,2] = 0 ã®ãšãã«éããŸãã
b ãšåçŽãªå¹³é¢ã P ã«ãã£ãŠ b ãšå¹³è¡ãªçŽç·ãŸãã¯ç¹ã«å€æãããããšããšèšãå€ããããŸããã
(2) A ããã以å€ã®å Žå
A ã¯å®å¯Ÿç§°è¡åãªã®ã§çŽäº€è¡å M ã§å¯Ÿè§åã§ãã
D = t(M)*A*M ãšãªããŸãã
ãã ããD ã¯å¯Ÿè§è¡åã§ãããd[3,3] = 0 ãšãªãããã«å¯Ÿè§åããããšããŸãã
A ã 3 次ã®åæ£å®å€ã©ã³ã¯ 2 ãªã®ã§ D ã 3 次ã®åæ£å®å€ã©ã³ã¯ 2 ã§ããŸã D ã¯å¯Ÿè§è¡åã§ãããæããã«å¯Ÿç§°è¡åã§ãã
ãŸããã®ãšããt(M)*b 㯠D ã®åºæå€ 0 ã«å¯Ÿå¿ããåºæãã¯ãã«ã§ãã
ããã§ãQ = t(M)*P*M ãšãããšããã㯠3 次å®å¯Ÿç§°è¡åã§ãã
å€åœ¢ãããšãP = M*Q*t(M) ã§ãã
ãã®ãšãã
tr(t(D)*Q) = tr(D*Q) = tr(t(M)*A*P*M) = tr(A*P) = tr(t(A)*P)
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t(b)*adj(P)*b
= t(b)*adj(M*Q*t(M))*b
= t(b)*adj(t(M))*adj(Q)*adj(M)*b
= t(b)*M*adj(Q)*t(M)*b
= t(t(M)*b)*adj(Q)*t(M)*b
ãšãªãã®ã§ãD ã A ãšãQ ã P ãšãt(M)*b ã b ãšèªã¿æ¿ããããšã§ (1) ã«åž°çããŸãã
çå·æç«æ¡ä»¶ã¯ãt(M)*b ãšåçŽãªå¹³é¢ã Q = t(M)*P*M ã«ãã£ãŠ t(M)*b ãšå¹³è¡ãªçŽç·ãŸãã¯ç¹ã«å€æãããããšã
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Σ[i=1..3]Σ[j=1..3]a[i,j]p[i,j] ã tr(t(A)P) ãšæžããããšã«ã¯æ°ã¥ããŸããã§ããã
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