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7,13 : 2,75 - 1 3/5 =
= 713/100 : 275/100 - 1 3/5 =
= 713/100 * 100/275 - 8/5 =
= 713/275 - 8/5 =
= 713/275 - 440/275 =
= 273/275
b)
6,5 + (3 1/3 - 0,5) : 2 1/3 =
= 6,5 + (10/3 - 1/2) : 7/3 =
= 6,5 +(20/6 - 3/6) * 3/7 =
= 6,5 + 17/6 * 3/7 =
= 65/10 + 17/2 * 1/7 =
= 13/2 + 17/14 =
= 91/14 + 17/14 =
= 108/14 =
= 7 10/14 =
= 7 5/7