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