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高一数学对数与对数运算

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/12 20:03:28
高一数学对数与对数运算
log2(25)*log3(4)*log5(9) ()里的是真数
log2 25*log3 4*log5 9
=log2 5^2*log3 2^2*log5 3^2
=2*log2 5*2*log3 2*2*log5 3
=8*(log2 5)*(log2 2)/(log2 3)*(log2 3)/(log2 5)
=8*log2 2
=8*1
=8

log2(25)*log3(4)*log5(9)
=log25/log2 * log4/log3 * log9/log5
= log25/log5 * log4/log2 * log9/log3
= 2*2*2
= 8