Odpowiedzi

2009-11-16T09:44:41+01:00
(×+1)²+(×-2)²=2(×-1)(×+1)
x² + 2x + 1 + x² - 4x + 4 = 2(x²-1)
2x² - 2x + 5 = 2x² - 2
5+2 = 2x
x = 3,5
2009-11-16T09:45:27+01:00
(×+1)²+(×-2)²=2(×-1)(×+1)
x²+2x+1+x²-4x+4=2(x²-1)
2x²-2x+5=2x²-2
2x²-2x+5-2x²+2=0
-2x+7=0
2x=7
x=7/2
x=3½
1 3 1