(x-4)²+(y+3)²=16/2/(x-2)²+(y-2)²=4/4/2파이/4/3/2/4/0<=a²+b²<4 또는 a²+b²>16/5/4/a<-2또는a>2/4/3/3/3/5/2파이/2분의13파이/x²+y²+x+y-2=0/4/4/3/칸수가부족
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