Odpowiedź:
[tex]2x+3y+5x-1y=7x+2y\\\\3x^2-5y^2+4x^2-3y^2=7x^2-8y^2\\\\7y+5x-2y-8x=5y-3x\\\\12x^2-3y^2-5x^2+7y^2=7x^2+4y^2\\\\8x-3y+7x-2y=15x-5y\\\\2x\cdot5y=10xy\\\\3x\cdot x\cdot5y=3x^2\cdot5y=15x^2y\\\\12x\cdot x\cdot y\cdot3=12x^2y\cdot3=36x^2y\\\\(-x)\cdot(-x)\cdot5=x^2\cdot5=5x^2\\\\-2\cdot a\cdot b\cdot(-3)=6ab[/tex]
