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1) $ab(x^2+y^2)+xy(a^2+b^2)$
2) $x^2+(a+b)xy+aby^2$
3) $a^2-(c+d)ab+cdb^2$
4) $(ab+xy)^2+(ay-bx)^2$
@ Chú ý : phải gõ latex.
2) $x^2+(a+b)xy+aby^2$
3) $a^2-(c+d)ab+cdb^2$
4) $(ab+xy)^2+(ay-bx)^2$
@ Chú ý : phải gõ latex.
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