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------------------ + -------- = -------
(x + 1)(x - 1) x + 1 x - 1
2(3x - 6) 1 4
------------------ + -------- - ------- = 0
(x + 1)(x - 1) x + 1 x - 1
6x - 12 x - 1 4x + 4
------------------ + ------------------ - ----------------- = 0
(x + 1)(x - 1) (x + 1)(x - 1) (x + 1)(x - 1)
6x - 12 + x - 1 - 4x - 4
------------------------------- = 0
(x + 1)(x - 1)
2
3x - 17 = 0 ===> 3x = 17 ===> x = 17/3 = 5 ---- ( A )
3
10) kereta I
===> v = 60 km/jam
===> berangkat pada pukul "t"
kereta II
===> v = 70 km/jam
===> berangkat pada pukul "t + 0,5 jam"
sehingga, persamaannya menjadi:
60 t = 70 (t - 0,5)
60 t = 70 t - 35
10 t = 35 ===> t = 3,5
Kereta I
Jarak stasiun A ke B ===> S = v x t
= 60 x 3,5
= 210 km
Kereta II
Jarak stasium A ke B ===> S = v x t
= 70 x (3,5 - 0,5)
= 210 km
Jadi supaya kereta I dan kereta II tiba bersamaan di stasiun B, maka jarak antara stasiun A dan B = 210 km ( B )
semoga jelas dan membantu ya