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由曲线x2+y2=|x|+|y|围成的图形的面积等于( ) A.π+2 B.π-...
由曲线x2+y2=|x|+|y|围成的图形的面积等于( )
A.π+2
B.π-2
C.2π
D.4π
考点分析:
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