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x^ - y^=20 (^-------->oznacza do kwadratu)
x=4-y
(4-y)^ -y^=20
x=4-y
16-8y+y^-y^=20
x=4-y
-8y=20-16
x=4-y
-8y=4
x=4-y
y= -1/2
x=4+1/2=4 i1/2
x=4i1/2
y= -1/2
Spr.
I równanie
L=x+y= 4i1/2 +(-1/2)=4i1/2-1/2=4
L=P
II równanie
L= x^ - y^= (4i1/2)^ - (-1/2)^= (9/2)^ - ( - 1/2)^=81/4-1/4 =80/4=20
L=P