TÌM 7  XDX .   7 1XXDX CA.

7 .

  ^B.  ⁷

^x

^{dx } _{ln 7} ⁷

^x

^{ C .}

x

1

C.  ₇

^x

_dx  ₇

^x

^

¹

 _{C .} ^D.  ⁷

^x

^{dx  7 ln 7}

^x

^{ C .}

x y z

 