Respostas

2014-06-22T19:34:33-03:00
75²-25²/62.5²-37.5²= (75.75)-(25.25)/62.25-37.25=(5625-625)/(1550-925)=5000/625=8
2014-06-22T19:42:39-03:00
75²- 25²=            5625 -625 =  5000                 5000/ 625= 8
 62.5² - 37.5²=     1550-925=  625