高一对数计算,

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/27 20:30:42

高一对数计算,
高一对数计算,

高一对数计算,
(1)log4^a=5,∴a=4^5=1024
(2)∵2log2^5=lg5)^2+(lg2)(lg50)
= (lg5)^2+(lg2)(lg25×2)
= (lg5)^2+(lg2)[lg(5^2)+lg2]
= (lg5)^2+(lg2)(2lg5+lg2)
= (lg5)^2+2(lg5)(lg2)+(lg2)^2
= (lg5+lg2)^2
= [lg(5×2)]^2
= (lg10)^2
= 1^2
= 1,∴2^2log2^5=2
log(2)^3 = 0.027279054723949≈0
所以2^-log2^3=1
(3)x=64