Odpowiedzi

2010-01-10T15:38:21+01:00
A)
( x - 2⅕) ⅕≤⅘
⅕x-¹¹/₅×⅕≤⅘
⅕x-¹¹/₂₅≤⅘
⅕x≤⅘+¹¹/₂₅
⅕x≤²⁰/₂₅+¹¹/₂₅
⅕x≤³¹/₂₅ /:(⅕)
x≤³¹/₂₅×⁵/₁
x≤³¹/₅
x≤6⅕

b )
0 > - ( 3 ⅔ - x )
0>-3⅔+x
3⅔>x

c)
( x + 2 1/7 ) - 6/7 ≥0
x+ 2 1/7 ≥6/7
x ≥6/7-2 1/7
x≥6/7-15/7
x≥-9/7
x≥-1 2/7