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soujii

1/ [tex]\int\limits_{0}^{e}\frac{ln(ex)}{3+xlnx}dx[/tex]

2/ [tex]\int\limits_{e}^{e^4}(\sqrt{lnx}+{\frac{1}{l\sqrt{lnx}})dx[/tex]

1/ [tex]\int\limits_{0}^{e}\frac{ln(ex)}{3+xlnx}dx \\ = \int_0^e \frac{1+lnx}{3=xlnx} \\ = \int_0^e \frac{d(xlnx+3)}{xlnx+3} \\ = ln(xlnx+3)|_0^e \\ =ln(e+3)[/tex]
ko biết có đúng ko nữa
 
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