Respostas

2014-03-11T09:07:03-03:00
X²-5x+10=
(2)²-5.2+10=
4-10+10=4

2014-03-11T09:34:48-03:00
X²- 5x+ 10      x=2
2² - 5.2 + 10
4- 10+10
6+10
= 10