Toán Lớp 8: Tìm x,y,z biết : 9x^2 + y^2 +2z^2 -18x + 4z -6y +20 = 0 -

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Toán Lớp 8: Tìm x,y,z biết : 9x^2 + y^2 +2z^2 -18x + 4z -6y +20 = 0