Respuesta:
13. -2x²+2y²-2xy+11x-y-14
14. 6x²+8y²-6xy+5-3y+16
15. -4x²+2y²-6xy+11x-y-4
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Respuesta:
13. -2x²+2y²-2xy+11x-y-14
14. 6x²+8y²-6xy+5-3y+16
15. -4x²+2y²-6xy+11x-y-4