[1/5 + 3/5 · (2 - 1/3)^2] : 7 + 1/15
[1/5 + 3/5 (6/3 - 1/3)^2] :7 + 1/15
1/5 + 3/5 (5/3)^2] : 7 + 1/15
1/5 + 3/5. 25/9 : 7 + 1/15
1/5 + 75/45 : 7 + 1/5
1/5 + 75/315 + 1/5
63/315 + 75/315 + 63/315 = 201/315 = 67/105
saludos
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[1/5 + 3/5 · (2 - 1/3)^2] : 7 + 1/15
[1/5 + 3/5 (6/3 - 1/3)^2] :7 + 1/15
1/5 + 3/5 (5/3)^2] : 7 + 1/15
1/5 + 3/5. 25/9 : 7 + 1/15
1/5 + 75/45 : 7 + 1/5
1/5 + 75/315 + 1/5
63/315 + 75/315 + 63/315 = 201/315 = 67/105
saludos