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lo primero es covertir las fracciones mixtas a impropias.
7 1/4= 29/4
3 1/2= 7/2
2 1/3= 7/3
29 (7 7 )
--- - ------ + -----
4 (2 3)
29 (21+14)
--- - -----------
4 (6)
29 35 87- 70 17
--- - ------- =------------= ------ LA RESPUESTA ES LA B)17/12
4 6 12 12