Вычислите сумму дробей с разными знаками:

а) 1/7+(-4/7)= -3/7 (пример)

б) -4/13 + 11/13 = ?

в) 3/8 + (-1/4)= ?

г) -9/14 + 5/14 = ?

д) 7/9 + (-5/18) = ?

е) -11/24 + 5/12 = ?

ж) 3/4 + (-4/5) = ?

з) -6/7 + 7/8 = ?

и) 5/24 + (-11/36)= ?

к) -1/27 + 13/36 = ?​
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