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----------
x + 3
-----------------
x^2 - 1
-----------
2x + 6
ubah jadi perkalian
x^2 + x 2x+6
---------- . ---------
x + 3 x^2 - 1
2x(x+1)(x+3)
------------------ coret pembilang dan penyebut yg sama
(x+3)(x+1)(x-1)
2x/(x-1)
jawaban D
no 21)
bersifat transitif (1,1),(1,2),(1,3),(2,2), (3,1),(2,1),(3,3)
sepertinya R1 , R2 dan R3 memenuhi