(loga(AB))平方+(logaB)平方减2loga(AB)logaB =多少

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(loga(AB))平方+(logaB)平方减2loga(AB)logaB =多少

(loga(AB))²+(logaB)²-2loga(AB)logaB
=(logaA+logaB)²+logaB-2(logaA+logaB)logaB
=(logaA)²+2logaAlogaB+2(logaB)²-2logaAloaaB-2(logaB)²
=(logaA)²

(LogaA)平方.原理a平方减b平方=(a-b)平方