quanto é: (3/1- 1/3) x (7/5 + 1/2) / 38/45
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3-1/3) . (7/5+1/2) : 38/45
8/3 . 9/10 : 38/45 (só fazer mmc)
8/1 . 3/10 . 45/38
4/1 . 3/5 . 45/38
4/1 . 3/1 . 9/38
108/38
2.84...
8/3 . 9/10 : 38/45 (só fazer mmc)
8/1 . 3/10 . 45/38
4/1 . 3/5 . 45/38
4/1 . 3/1 . 9/38
108/38
2.84...
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