Question

一道数学题（急！！！！！帮帮忙！！！！！）

Answer 1

你好

8＾x=5
x=log（8）5
=lg5/lg8
=0.7739760316291207826234398098298

精确到0.0001的x值为0.7740

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Answer 2

x=lg5/lg8
=lg(10/5)/(3lg2)
=(1-lg2)/3lg2
=1/(3lg2)-1/3
=1/(3*0.3010)-1/3

=0.7740
lg2的值应由题设给出！

Answer 3

8^x=5
x=log(8) 5
x≈0.7739760316
x≈0.7740

Answer 4

8^x = 5
xlg8 = lg5

x = lg5/lg8
≈ 0.7740

Answer 5

x=log8 5=lg5/3lg2=(1-lg2)/3lg2=(1-0.3010)/0.903=0.7741

Answer 6

0.7740