Toán Lớp 8: Tìm $x,y,z$ biết:
a, $x^{2}$ – $2x$ +$y^{2}$ +$4y$ + $4z$ + $6$ $=0$
b, $x^{2}$ + $4y^{2}$ + $z^{2}$ – $2x$ – $6z$ +$8y$ + $15=0$
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Toán Lớp 8: Tìm $x,y,z$ biết:
a, $x^{2}$ – $2x$ +$y^{2}$ +$4y$ + $4z$ + $6$ $=0$
b, $x^{2}$ + $4y^{2}$ + $z^{2}$ – $2x$ – $6z$ +$8y$ + $15=0$
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