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15 - r r 901501 C K r r c B 9 k r 4(1 r 4(1 1>8.9 > 1.975 1...

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˜ r r
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901501
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€Ä ˜ ›+ €Ä ˜ ›+ €Ä ˜ ›+ €Ä ˜ ›+ È KC ¸ 19 r 8.99 r c 9 k r 4(1+++….+) r 1 c 4(1+++….+)+1>8.9 > 1.975 1 - > 0.9875 0.0125 > 2 k > 80 9 k c 7 7 9 9 1. =1” r c !> 7 1 2. c 34c 9 9 217 9 ,9 9 202 9 9 ,9 9 210 9 ,9 9 215 9 ,c ! 9
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901502
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a=1+2+…..+109 b=1 2 +2 2 +…..+10 2 9 c=1 3 +2 3 +…..+10 3 9 d=1 4 +2 4 +…..+10 4 9 1~10 9 2c ! S 1~10 9 4 c ! T 9 S=1 × 2+1 × 3+1 × 4+…..+8 × 10+9 × 109 T=1 × 2 × 3 × 4+1 × 2 × 3 × 5+1 × 2 × 3 × 6+…..+6 × 8 × 9 × 10+7 × 8 × 9 × 109 9 a,b,c,dc S9 T9 c c S=(a 2 - b)9 T=[a 4 - 6a 2 b+8ac+3b 2 - 6d] 1.9 1,2,…..,9,10 9 x y × ΞΞΞΞ (1+2+…..+10)(1+2+…..+10)c ! x = y 1 2 +2 2 +…..+10 2 c 9 x y 9 x y9 S={(1+2+…..+10)(1+2+…..+10) - ( 1 2 +2 2 +…..+10 2 )= (a 2 - b) 2.9 1,2,…..,9,10 9 4 9 x , y , z ,9 u × × × ¬¬¬¬ (1+2+…..+10)(1+2+…..+10)(1+2+…..+10)(1+2+…..+10)c ! (1) x = y = z = u 1 4 +2 4 +3 4 …..+10 4 9 (2) x = y =z u (1 3 +2 3 +…..+10 3 )(1+2+…..+10) - (1 4 +2 4 +…..+10 4 )9 (3)( x = y ) ( z = u )9 (1 2 +2 2 +…..+10 2 )(1 2 +2 2 +…..+10 2 ) - (1 4 +2 4 +…..+10 4 )9 (4) x = y x , z , u c !
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