求定积分,上线2,下线1,X^-3dX

问题描述:

求定积分,上线2,下线1,X^-3dX

∫(1,2) x^(-3) dx
=(-1/2)x^(-2) | (1,2)
=(-1/2)[2^(-2)-1^(-2)]
=(-1/2)(-3/4)
=3/8