log2(3)=x
2^x=3
(2^(2x)-2^(-2x))/(2^(x)-2^(-x))
=[(2^x)^2-1/(2^x)^2]/[2^x-1/2^x]
=[(2^x+1/2^x)(2^x-1/2^x)]/[2^x-1/2^x]
=2^x+1/2^x
=3+1/3
=10/3
若x=log2(3),求[2^(3x)-2(-3x)]/[(2^x)-2^(-x)]的值
若x=log2(3),求[2^(3x)-2(-3x)]/[(2^x)-2^(-x)]的值
数学人气:101 ℃时间:2020-05-06 06:07:29
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