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Ответ дан
xxxeol

Пошаговое объяснение:

Надо знаменатели приводить к НОК.

1) - 2/3 + 5/8 = (НОК=3*8=24) = - (2*8  + 5*3)/24 = - 1/24 - ответ

2) -11/16 - 5/8 = (НОК=16) = (-11 - 10)/16 = -21/16 = - 1 5/16 - ответ

3) - 6/35 + 3/10 = (НОК=70) = (- 6*2 + 3*7)/70 = (-12+21)/70 = 9/70 - ответ

4)  -7/12 - 3/8 = (НОК=24) = (-7*2 - 3*3)/24 = - 23/24 - ответ

5) 4/15 - 8/9 = (НОК=45) = (4*3 - 8*5)/45 = -28/45 - ответ

6) 3/10 - 4/15 = (НОК=30) = (3*3 - 4*2)/30 = 1/30 - ответ

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