Respostas

2014-02-17T14:42:30-03:00
A²+b²=25    x²=25    x=5

a+b= 7
a=b-7
a²+b²=25
b²-14b+49+b²=25
2b²-14b+42=0
b²-7b+12=0

delta= 49-4.1.12= 49-48 = 1
v1=1

7+1/2 = 4
b=4

a=7-b
a= 7-4
a= 3

a= 3 e b = 4

3²=9
4²=16

9+16 = 25
1 5 1