z=ln(x+y-1)的定义域是?
问题描述:
z=ln(x+y-1)的定义域是?
答
{(x,y)|x+y-1>0}
答
x+y-1>0且不等于1 x>1-y且x≠2-y
z=ln(x+y-1)的定义域是?
{(x,y)|x+y-1>0}
x+y-1>0且不等于1 x>1-y且x≠2-y