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9 and 5 / 7 - (2 and 1 / 13 + 4 and 5 / 7 + 11 / 13)
9 and 5 / 7 - (2 and 1 / 13 + 4 and 5 / 7 + 11 / 13)
=9 5 / 7-2 1 / 13-4 5 / 7-11 / 13
=9 and 5 / 7-4 and 5 / 7 - (11 / 13 + 2 and 1 / 13)
=5-2 and 12 / 13
=2 and 1 / 13
In this case, we should first use the law of exchange and the law of association, and first calculate the addition and subtraction of the same denominator,
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