没有明白,第一步,如何变道第二步的?
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/15 22:21:19
没有明白,第一步,如何变道第二步的?
∫x/(4-5x) dx
=∫(x-4/5+4/5)/(4-5x) dx
=∫[1/5-4/(25x-20)]dx
=x/5-4/25 ∫1/(25x-20) d(25x-20)
=x/5-4/25 ln|25x-20|+C
∫x/(4-5x) dx
=∫(x-4/5+4/5)/(4-5x) dx
=∫[1/5-4/(25x-20)]dx
=x/5-4/25 ∫1/(25x-20) d(25x-20)
=x/5-4/25 ln|25x-20|+C
∫x/(4-5x) dx
=∫(x-4/5+4/5)/(4-5x) dx
=∫[(x-4/5)/(4-5x) +4/5/(4-5x)] dx
=∫[-1/5-4/(25x-20)]dx
=-x/5-4/25 ∫1/(25x-20) d(25x-20)
=-x/5-4/25 ln|25x-20|+C
=∫(x-4/5+4/5)/(4-5x) dx
=∫[(x-4/5)/(4-5x) +4/5/(4-5x)] dx
=∫[-1/5-4/(25x-20)]dx
=-x/5-4/25 ∫1/(25x-20) d(25x-20)
=-x/5-4/25 ln|25x-20|+C