Răspunsuri

2014-09-19T09:09:15+03:00
X-y=16
x²+y²=706
xy=?
x=16+y
x²=256+32y+y²
256+32y+y²+y²=706
2y²+32y-450=0
x1=-25
x2=9
atunci 
x1-y1=16
y1=-25-16=-41
y2=-16+9=-7

x.y=-41.(-25)=-1025

si a doua varianta
x.y=9.(-7)=-63
1 4 1