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請教一題

請教一題

abc為實數,若2bcb2+c2a2+2aca2+c2b2+2aba2+b2c2=1
2bcb2+c2a23+2aca2+c2b23+2aba2+b2c23= 
(A)2 (B)1 (C)1 (D)3

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