a)X mũ 2 – 2x+xy b)ax-y+ay-x c)2x mũ 2-4x+2+2xy-2y d)x mũ 2-16+2xy+y mũ 2 e)25-x mũ 2-2xy-y mũ 2

0 bình luận về “a)X mũ 2 – 2x+xy b)ax-y+ay-x c)2x mũ 2-4x+2+2xy-2y d)x mũ 2-16+2xy+y mũ 2 e)25-x mũ 2-2xy-y mũ 2”

1. a) $x^2-2x+xy$

   $=x(x-2+y)$

   b) $ax-y+ay-x$

   $=(ax+ay)-(x+y)$

   $=a(x+y)-(x+y)$

   $=(x+y)(a-1)$

   c) $2x^2-4x+2+2xy-2y$

   $=2(x^2-2x+1)+2y(x-1)$

   $=2(x-1)^2+2y(x-1)$

   $=(x-1)[2(x-1)+2y]$

   $=(x-1)(2x-2+2y)$

   d) $x^2-16+2xy+y^2$

   $=(x^2+2xy+y^2)-4^2$

   $=(x+y)^2-4^2$

   $=(x+y-4)(x+y+4)$

   e) $25-x^2-2xy-y^2$

   $=5^2-(x^2+2xy+y^2)$

   $=5^2-(x+y)^2$

   $=(5-x-y)(5+x+y)$

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