y=ln^3(5x+2)^2
y'=3ln²（5x+2）² [ln(5x+2)²]'
=3ln²（5x+2）² [1/(5x+2)²][(5x+2)²]'
=[3ln²（5x+2）² /(5x+2)²][2(5x+2)](5x+2)'
=[6ln²（5x+2）² /(5x+2)]×5
=30ln²（5x+2）²/(5x+2)
=30(2ln(5x+2))² /(5x+2)
=[120ln²（5x+2)]/(5x+2)
这个就是答案了