Odpowiedzi

2009-11-19T17:35:56+01:00
X- 1liczba
y- 2liczba
x+y=20
i
x^2+y^2=208

x=20-y
i
(20-y)^2 +y^2=208
400+40y+y^2+y^2=208
2y^2+40y+192=0/:2
y^2+20y+96=0
Delta:400-384=16
y= (-20+4)/2 lub y=(-20-4)/2
y=-8 y=-12
x=12 x=8
Odp te liczby to (-8) i 12 lub -12 i 8
2009-11-19T17:36:43+01:00
X+y=20
(x+y)²=208

y=20-x
x²+2xy+y²=208

y=20-x
x²+2x×(20-x)+(20-x)²=208

y=20-x
x²+40x-2x²+400-40x+x²=208

y=20-x


2009-11-19T17:42:54+01:00
A+b=20
a²+b²=208

a=20-b
(20-b)²+b²=208
400-40b+b²+b²=208
-40b+2b²=-192 /*-1
40b-2b²=192
b=8

20-8=12

Te liczby to : 8 i 12.

;DD