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lulola


a/tìm nghiem nguyen duong cua phương trinh x^2+y(y^2+y-3x)=0
b/tìm nghiem nguyen (y+1)^4+ y^4= (x+1)^2+x^2
b/tìm nghiem nguyen (y+1)^4+ y^4= (x+1)^2+x^2
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