\[
\left(x - \frac{1}{2}\right)^2 + \left(y- \frac{1}{2}\right)^2 = 0
\]
\left(x - \frac{1}{2}\right)^2 + \left(y- \frac{1}{2}\right)^2 = 0
\]
所跟帖: 脝陆脮媒 : 脭脵脌麓录脝脣茫拢潞 2021-09-22 20:18:54
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