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  1. 11-10-2013, 08:17 PM Top | #1
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  3. 11-11-2013, 11:13 PM Top | #2
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  5. 11-13-2013, 03:04 PM Top | #3
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    ; 11-13-2013 03:16 PM


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  9. 11-13-2013, 06:57 PM Top | #5
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  11. 11-13-2013, 07:11 PM Top | #6
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    http://www.gulfup.com/?WZIcLh



    (a + 3 d ) (a + 8 d ) = 20 →a+3d a- 8d =20 → - 5 d= 20→ d = -4


    a + d = 2 ( a+ 3 d ) →a 4 = 2a -24 →a= 20

    <20 , 16 ,12, 8 , 4 , 0 , -4 , -8 , -12 , . . . >
    ; 11-18-2013 11:41 PM


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  13. 11-16-2013, 11:40 PM Top | #7
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    http://www.gulfup.com/?tOndTV
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  15. 11-17-2013, 10:52 PM Top | #8
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    http://www.gulfup.com/?O9R8ot
    ; 11-18-2013 11:49 PM


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  17. 11-18-2013, 07:10 PM Top | #9
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    :
    ; 11-18-2013 11:51 PM
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