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a/b
jadi
(a+2)/(b+1) =1/2
2a+4 =b+1
=2a-b =-3.....(1)
(a+1)/(b-2) =3/5
5a+5 =3b-6
5a-3b =-11....(2)
persamaan (1) dikali 3
jadinya
6a-3b =-9
jika (1)-(2) diperoleh
a=2...subtitusi 2 ke (1) diperoleh b=7
jadi pecahannya adalah 2/7