тест; решите неравенство: 
 
5 х²+4х -1/7-2х ≥0

a) (-∞: -1) υ (0,2 : 3,5)
b)(-1:0,2) υ (3,5:∞)
c)(-1:0,2) υ (0,2:∞)
d) (1:3,5) υ (4:∞)
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