uklad równan lola:

⎧	x(y+z)=5
⎨	y(z+x)=10
⎩	z(x+y)=13

Mila: x(y+z)=5 y(z+x)=10 z(x+y)=13 −−−−−−−−−− xy+xz=5 xy+yz=10 xz+yz=13 −−−−−−−−−−−−− + 2xy+2xz+2yz=28 /:2 xy+xz+yz=14⇔yz=14−5⇔yz=9 xy=10−9 ⇔xy=1 xz=13−9⇔xz=4 ================ yz=9 i xy=1 i xz=4

xy		1		y		1
	=		⇔		=		⇔z=4y
xz		4		z		4

y*4y=9

	9
y2=
	4

	3		3
y=		lub y=−
	2		2

To już dokończ