y=根号下-x(x=0) B.y=-x^2(x>=0) C.y=x^2(x
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y=根号下-x(x=0)B.y=-x^2(x>=0)C.y=x^2(xy=根号下-x(x=0)B.y=-x^2(x>=0)C.y=x^2(xy=根号下-x(x=0)B.y=-x^2(x>=0)C.y=
y=根号下-x(x=0) B.y=-x^2(x>=0) C.y=x^2(x
y=根号下-x(x=0) B.y=-x^2(x>=0) C.y=x^2(x
y=根号下-x(x=0) B.y=-x^2(x>=0) C.y=x^2(x
B
y^2=-x
x=-y^2
y=-x^2
因为原函数定义域为x=0
所以现在的定义域为x>=0
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