函数z=ln(4-x2-y2)-xy/√x2+y2-3的定义域是()
A.{(x,y)|x2+y2<4,x2+y2≥3} B.{(x,y)|x2+y2≤4,x2+y2≥3} C.{(x,y)|x2+y2≤4,x2+y2>3} D.{(x,y)|x2+y2<4,x2+y2>3}正确答案D
函数z=ln(4-x2-y2)-xy/√x2+y2-3的定义域是()
A.{(x,y)|x2+y2<4,x2+y2≥3} B.{(x,y)|x2+y2≤4,x2+y2≥3} C.{(x,y)|x2+y2≤4,x2+y2>3} D.{(x,y)|x2+y2<4,x2+y2>3}正确答案D