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# 08 - 89801 a,b,c,d R R a b=c,b c=d,c d=a8 b a b c d a b=c(1...

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89801
a,b,c,d R a+b=c,b+c=d,c+d=a8 b a+b+c+d R a+b=c---(1) b+c=d---(2) c+d=a---(3) 8 (1)+(2)+(3) 2b+c=0 c=-2b 8 (1)8 a=-3b 8 (1)+(3)8 b=-d 8 a+b+c+d=-3b+b-2b-b=-5b -5 R -5 8 8 R a+b=c---(1) b+c=d---(2) c+d=a---(3) 8 (1)+(3) a+b+c+d = a+c b=-d---(4) 8 b 8 8 1 d 1 b - (4)8 (1) a-d=c ---(5) (4)8 (2) c-d=d c=2d ---(6) (6)8 (5) a-d=2d a=3d ---(7) 8 a+b+c+d=3d-d+2d+d=5d -5 8 a+b+c+d 8 -5 8 8

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89802
a E 1R [a]E 1 a E 1R (a)8 a8 [a]8 - - - = + + - - - = + + - - - = + + ) 3 ( 6 . 2 ) y ( ] x [ z ) 2 ( 7 . 7 ) x ( ] z [ y ) 1 ( 5 . 1 ) z ( ] y [ x 1 (1)+(2)+(3) 2(x+y+z)=11.8 x+y+z=5.9---(4) (2)+(1) x+y+z+[y]+(x)=9.2 [y]+(x)=3.3 [y]=3, (x)=0.3 (2)+(3) x+y+z+[z]+(y)=10.3 [z]+(y)=4.4 [z]=4, (y)=0.4 (3)+(1) x+y+z+[x]+(z)=4.1 [x]+(z)=-1.8=-2+0.2 [x]=-2,(z)=0.2 x= - 1.7, y=3.4, z=4.2

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89803
¤ s X * n G 8 1 8 ,8 ,….,8 A 1 ,A 2 ,…..An 8 n G R G A 1 R 1 8 ,A 2 8 1 8 8 , R 3 … … A n 8 n-1 » ,8 n 8 2n-1 G 8 =1×(1+ + + +…+ + )+3×(+ + +…++ )+ 5×(+…+ )+…….+(2n-3)×(+ )+(2n-1)×( ) =×[1+3+5+……+(2n-1)]+ ×[1+3+5+….(2n-3)]+…..+ ×(1+2+3)+×(1+3)+1×1 =×n 2 +×(n-1) 2 +…..+×3 2 +×2 2 +1×1 =n+(n-1)+…..+3+2+1= R

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89804 8 C,8 L 8 A, G L 8 C 8 8 P 8 Q,8 AP + PQ x x A L C
8 1.8 A 8 L 8 A / 2.8 C 8 O 8 A / R L 8 C 8 P,Q 8 8 P,Q R R L 8 C R P / 8 Q / , 8 ,,,,,8 =,=

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