Odpowiedzi

2009-12-04T15:23:15+01:00
1.
2x + 3 2x
₋₋₋₋₋₋₋ = ₋₋₋ + x
5 3

x=2x + 6x
---------------= +x
15

X= 8x
----- = +x
15

x=0,53 x + x
x= 0,53x kwadrat .

Drugiego nie wiem . Sorryy . ;PP
2009-12-04T15:26:40+01:00
(2x + 3) / 5 = [(2 -x) / 3] + x /×15
6x + 9 = 10 - 5x + 15x
-4x = 1
x = -1/4

5x - 4 ≤ 6 lub 5x - 4 ≥ -6

5x - 4 ≤ 6
5x ≤ 10
x ≤ 2

5x ≥ -2
x ≥ -0,4

x ∈ <-0,4; 2>
2009-12-04T15:30:22+01:00