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dung_1995


He pt nè
x^3*y*(1+x) + x^2*y^2(2+y) + xy^3 - 30 = 0
x^2 + x(1+y+y^2) + y - 11 = 0
thanks truoc







x^3*y*(1+x) + x^2*y^2(2+y) + xy^3 - 30 = 0
x^2 + x(1+y+y^2) + y - 11 = 0
thanks truoc
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