Doprowadź wyrażenie do najprostrzej postaci.
(x+y+1)(2x-y)+(-1)(x-1)(2x+3y)=
6x+3y+(-1)
=2x²-xy +2xy-y²+2x-y -(2x²+3xy-2x-3y)=
=2x²-y²+xy+2x -y -2x²-3xy+2x+3y=
=-y²-2xy+4x+2y
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6x+3y+(-1)
(x+y+1)(2x-y)+(-1)(x-1)(2x+3y)=
=2x²-xy +2xy-y²+2x-y -(2x²+3xy-2x-3y)=
=2x²-y²+xy+2x -y -2x²-3xy+2x+3y=
=-y²-2xy+4x+2y