Odpowiedzi

2010-04-13T08:33:12+02:00
1

.-x²-3x-2=0

∆=b²-4ac
∆=(-3) ²-4 razy (-1) razy (-2)
∆=9-8
∆=1
-b+√∆ 3+1 4
x1=----------------=---------------------=-----= -2
2a 2 razy (-1) -2



-b-√∆ 3-1 2
x2=----------------=---------------------=-----= -1
2a 2 razy (-1) -2


Zadanie3




|x-¹/₂|<4 lub x-1/2<4
-x+1/2<4 x<4 ½
-x<3 ½
x>-3 ½




b=(⁴/₉)⁻¹ *(⁴/₉)⁻¹/₂*(8⁻¹/₁₂)⁴

1 1
(4/9)⁻3/2 *(8)-3/4 =---* -----
3/2 ¾
4/9 81/9