Explicación paso a paso:
9/10 + 5/12 - 11/15 = 54/60 + 25/60 - 44/60 = 35/60 = 7/12
8/15 - 9/20 + 1/12 = 32/60 - 27/60 + 5/60 = 10/60 = 5/30 = 1/6
11/12 + 1/14 - 13/21 = 77/84 + 6/84 - 52/84 = 31/84
3/16 + 5/18 + 7/36 = 27/ 144 + 40/144 + 28/144 = 95/144
Espero que te sirva :)
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Explicación paso a paso:
9/10 + 5/12 - 11/15 = 54/60 + 25/60 - 44/60 = 35/60 = 7/12
8/15 - 9/20 + 1/12 = 32/60 - 27/60 + 5/60 = 10/60 = 5/30 = 1/6
11/12 + 1/14 - 13/21 = 77/84 + 6/84 - 52/84 = 31/84
3/16 + 5/18 + 7/36 = 27/ 144 + 40/144 + 28/144 = 95/144
Espero que te sirva :)