Đáp án:
` -5/7 - (-5/67) + 13/30 + 1/2 + (-1 5/6) + 1 3/14 - (-2/5)`
` = -5/7 + 5/67 + 13/30 + 1/2 - 11/6 + 17/14 + 2/5`
` = (- 5/7 + 17/14 + 13/30 + 2/5 - 11/6 +1/2) + 5/67`
` = ( -5/7 + 17/14 +1/2) + (13/30 +2/5 -11/6) + 5/67`
` = 1 + (-1) + 5/67`
` = 5/67`