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1) 4x^2-4xy+y^2
2)a^2+14a+49
3) a^2(a^2-1)-9(a^2-1)
4) nx+ny+5x+5y
5)wx-wy+7bx-7by
6) 3x^2+20x+25
7) x^3-27
8) 64y^3-1
9) 5x^2-29x-6
10) 7x^2-9x+2
Espero te sirvan amigo.