对数式2log5_10 +log5_0.25的值
问题描述:
对数式2log5_10 +log5_0.25的值
答
2log5^10+log5^0.25
=2lg10/lg5+lg0.25/lg5
=lg100/lg5+lg0.25/lg5
=(lg100+lg0.25)/lg5
=lg25/lg5
=2lg5/lg5
=2