Nomor 11 dong beserta caranya:)

1/3+2/7/1/3-2/7=(7/21+6/21)/(7/21-6/21)
                       =13/21/1/21
                       =13/21×21/1
                       =13

Bab Bilangan Pecahan
Matematika SD Kelas VI

(1/3 + 2/7) : (1/3 - 2/7)
= (7 + 2 . 3)/(3 . 7) : (7 - 2 . 3)/(3 . 7)
= (13/21) : 1/21
= (13/21) x 21
= 13

jawabannya A