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kieuthuy1995
2 năm trước
Tìm x và y thuộc Z: a. 4x^2+y^2-2y=13 b. x^2+2xy+3y^2=10 c. x^2+y^2=13 d. x^2y^2+2x-2y=9 e. x^2+y^2+4x+6y=10 f. x^2+2xy+3y^2+2y=7 g. x^2-2xy+2y=10 h.x^2-4y^2=12 k. x^2-y^2+4x+4y=20
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