log3 2/log5 4怎样化简(3和5是角标)
问题描述:
log3 2/log5 4怎样化简(3和5是角标)
答
原式=(lg2/lg3)/(lg4/lg5)
=(lg2/lg3)/(2lg2/lg5)
=lg5/(2lg3)
=lg5/lg9
=log9(5)