1 https://img85.imageshack.us/img85/9172/mat20032012.jpg

2 https://img827.imageshack.us/img827/...at20032012.jpg

3 https://img221.imageshack.us/img221/...t20032012s.jpg

4 https://img600.imageshack.us/img600/...at20032012.jpg

5 https://img855.imageshack.us/img855/...t20032012e.jpg

http://f1203.hizliresim.com/v/n/3pthc.jpg

http://f1203.hizliresim.com/v/n/3ptw0.jpg

1)
https://img717.imageshack.us/img717/...at23032012.jpg
https://chart.apis.google.com/chart?...CPA%5Cright%7C
https://chart.apis.google.com/chart?...E%7B2%7D%7D%20
https://chart.apis.google.com/chart?...B2%7D%5Cright)
https://chart.apis.google.com/chart?...5Ccdot%20x%3D0
https://chart.apis.google.com/chart?...5Ccdot%20x%3D0

3)
https://img341.imageshack.us/img341/...at23032012.jpg
https://img560.imageshack.us/img560/...at23032012.jpg

5)
x²+y²=16
y=mx+n

y²=m²x²+2mnx+n²=16−x²
(m²+1)x²+2mnx+n²−16=0

x₁=−x₂
x₁+x₂=0

−

b

a

=0

−

2mn

m²+1

=0

m.n=0