求定积分(9-x)/(x^2+2x-3) 2到3

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/25 10:05:05
求定积分(9-x)/(x^2+2x-3)2到3求定积分(9-x)/(x^2+2x-3)2到3求定积分(9-x)/(x^2+2x-3)2到3点击放大:分项积分因为∫(9-x)/(x^2+2x-3)dx=

求定积分(9-x)/(x^2+2x-3) 2到3
求定积分(9-x)/(x^2+2x-3) 2到3

求定积分(9-x)/(x^2+2x-3) 2到3
点击放大:

分项积分
因为
∫(9-x)/(x^2+2x-3)dx
=∫[-2(x-1)+(x+3)+4]/[(x-1)(x+3)]dx
=-2∫1/(x+3)dx+∫1/(x-1)dx+∫4/[(x-1)(x+3)]dx
=-2∫1/(x+3)dx+∫1/(x-1)dx+∫[1/(x-1)-1/(x+3)]dx
=-2ln|x+3|+ln|x-1|+ln|x-1|-ln|x+3|+C
=-3ln|x+3|+2ln|x-1|+C
所以原定积分=-3ln6+2ln2+3ln5