Question

-2=log以a为底二的对数加log以a为底二的对数,求a

Answer 1

问：-2=log以a为底二的对数加log以a为底二的对数,求a

答：-2=log以a为底二的对数加log以a为底二的对数,求a是-2

答：（1）因为logaX+logaY=loga（XY),所卖锋消以loga（2）+loga（1/2）=loga(2*1/2)=loga(1)=0(2)logaX-logaY=loga（X/Y),所中知以基迹答案为-2

答：log(a)2+log(a)1/2 =log(a)2+log(a)2^[-1] =log(a)2-log(a)2 =0