Respostas

A melhor resposta!
2014-04-24T22:19:58-03:00
(3x²-5x+7)+(5x²-3x-2)
3x²+5x²-5x-3x+7-2
8x²-8x+5

(3x²-5x+7)-(5x²-3x-2)
3x²-5x²-5x+3x+7+2
-2x²-2x+9

2 5 2