Respostas

2013-12-19T06:19:13-02:00
MMC:
1/y² - 2/xy + 1/x²
x²/x²y² - 2xy/x²y² + y²/x²y²
(x² - 2xy + y²)/x²y²
(x - y)²/(xy)²
3 3 3