Odpowiedzi

2010-03-09T21:28:09+01:00
A)
{ (√8-x)(√8+x)+x²=8y
{ (y-2x)(y+2x)=(y+1)²-x(4x+2)

{8-x²+x²=8y
y²-4x²=y²+2y+1 -4x²-2x

{y=1
-2y+2x=1

{y=1
-2+2x=1 2x=3 x=3/2

b)
{ (x+2)²-(y+2)²=3+(x-3)²-y²
{ x-5y+3*(2x+3)/2-(1½+3y)/3=0


{x²+2x+4-y²-4y-4=3+x²-6x+9-y²
x-5y+6x+9/2-1/2-y=0


{8x-3y=12
7/2x-5/2y+4-y=0

{8x-3y=12 /*(-7/2)
7/2x-7/2y=-4/ *3

{-28x+21/2y=-42
21/2x-21/2y=-12
___________+
-17,5x=-54/:(-17,5)
x=3 3/35
-3y=12-8*3 3/35=12-24 24/35=-12 24/35 /:(-3)
y=4 24 /35