Respostas

2013-12-08T01:28:42-02:00
( X²Y³ + 4X²Y² - X²Y) + ( - 3X²Y² + 2X²Y - XY² - XY)

X²Y³ + 4X²Y² - X²Y -3X²Y² + 2X²Y -XY² - XY

X²Y³ + X²Y² + X²Y - XY² - XY