函数z=ln(4-x2-y2)-xy/√x2+y2-3的定义域是()
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
【题目解析】:对数函数的自变量非负,分式分母不为零.
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