e^3a=8解得a=In2..
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e^3a=8解得a=In2..e^3a=8解得a=In2..e^3a=8解得a=In2..e^3a=83a=ln83a=ln(2^3)3a=3ln2a=ln2e^3a=8==>e^(3a)=2^3==
e^3a=8解得a=In2..
e^3a=8解得a=In2
..
e^3a=8解得a=In2..
e^3a=8
3a=ln8
3a=ln(2^3)
3a=3ln2
a=ln2
e^3a=8
==>
e^(3a)=2^3
==>
e^a =2
两边取自然对数
ln(e^a) =ln2
==>
alne =ln2
==>
a=ln2
够详细了吧?
e^3a=8,算式两边同时ln,则ln(e^3a)=1n8,则3a=3(ln2)