1/(11+5x)^3
=(11+5x)^(-3)
所以原式=∫(11+5x)^(-3)*1/5d(5x)
=1/5∫(11+5x)^(-3)d(11+5x)
幂函数求积分
=1/5*(11+5x)^(-3+1)/(-3+1) (-2,-1)
=-1/10*1/(11+5x)^2
=-1/360-(-1/10)
=7/72
1/(11+5x)^3
=(11+5x)^(-3)
所以原式=∫(11+5x)^(-3)*1/5d(5x)
=1/5∫(11+5x)^(-3)d(11+5x)
幂函数求积分
=1/5*(11+5x)^(-3+1)/(-3+1) (-2,-1)
=-1/10*1/(11+5x)^2
=-1/360-(-1/10)
=7/72