答:
∫ 5/{ x [ln(7x)]^7 } dx
=∫ 5/ [ln7+lnx]^7 d(lnx)
=∫ 5/ (lnx+ln7)^7 d(lnx+ln7)
=(-5/6)*(lnx+ln7)^(-6) +C
=-(5/6)/ [ln(7x)]^6+C
答:
∫ 5/{ x [ln(7x)]^7 } dx
=∫ 5/ [ln7+lnx]^7 d(lnx)
=∫ 5/ (lnx+ln7)^7 d(lnx+ln7)
=(-5/6)*(lnx+ln7)^(-6) +C
=-(5/6)/ [ln(7x)]^6+C