EFETUE OS CALCULOS.\nA) 2\/3 + 5\/3 = C) 6\/7 - 1\/7 =\nB) 11\/19 +3\/19 = D) 10\/11 - 5\/11 + 7\/11 =\nresposta por favor ?

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a) \({2 \over 3} + {5 \over 3} = {{2 + 5} \over 3} = {7 \over 3}\)

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b) \({{11} \over {19}} + {3 \over {19}} = {{11 + 3} \over {19}} = {{14} \over {19}}\)

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c) \({6 \over 7} - {1 \over 7} = {{6 - 1} \over 7} = {5 \over 7}\)

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d) \({{10} \over {11}} - {5 \over {11}} + {7 \over {11}} = {{10 - 5 + 7} \over {11}} = {{5 + 7} \over {11}} = {{12} \over {11}}\)