In(5y+3x)
问题描述:
In(5y+3x)
请给是具体过程 (好像要把5y+3x设为t什么的)
答
dln(3x+5y)/dx=1/(5y+3x)*d(5y+3x)/dx=3/(5y+3x)
dln(3x+5y)/dy=1/(5y+3x)*d(5y+3x)/dy=5/(5y+3x)