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5a-4b+2c-7a+3b-8c+6a-4b+2c= + a - a a + b b - b + c c - c= + 7x-4+8x2-3x+5-4x2+9x-3+10x2= Ordenando x - x2 x x + - x + x2 x2 - x2 = + 4x2y-7xy+5x3y-2x2y+10xy-7x3y+2x2y-xy+8x3y= Ordenando x2y - x2y x x2y + y xy xy - x y x3y= xy + xy x3y - x3y= + 5z+4y-2x+8y-3z+4x-10z+6x-4y+x-y+z= Ordenando z - z z + y y - x= y + x- x= |