求e^-5x的不定积分,要详细过程.谢谢
问题描述:
求e^-5x的不定积分,要详细过程.谢谢
答
∫e^(-5x)dx
令u=-5x
则du/dx=-5
dx=-(1/5)du
∫e^(-5x)dx
=∫e^u×[-(1/5)]du
=-(1/5)e^u+C
还原:u=-5x
=-(1/5)e^(-5)+C