log2 3/log2 5等于log2 3-log2 5么?

log2 3/log2 5等于log2 3-log2 5么? log2(3)×log2(4)=log2(7)?log2(3)×log2(4)=log2(7)吗?log2(1/49)+log2(1/16)+log2(1/27)等于多少呢?帮个忙! log2 5 x log2 5等于log2 25还是什么? log2 3乘以log2 3等于2log2 log2 20---log2 5+log3 4 * log4 3 等于什么 log2 50-2log2 5 等于多少? log2 6-log2 3 log2^6-log2^3 log2(4)/log2(3) log2 5/log2 3为什么等于log3 5 log2 5,log2 3的2是角标 log3 5的3是角标log2 5/log2 3为什么等于log3 5log2 log2 3的2是角标，log3 5的3是角标 log2^(4^7*2^5)+log2^6-log2^3 3^(log2 (5))-5^(log2(3)) log2(log2 log2^5+3= 计算：（1）log2 (4^3*8^5);(2)log2 3+log2 6-log2 9 计算：log2(log2 32-log2 3/4+log2 6) log2 5/4+log2 5 log2.5 625等于多少?