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

分类: 作业答案 • 2022-03-22 20:36:19

问题描述：

答

(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