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5/8 - {1/3 . [7/20 - 7/10] } =
5/8 - {1/3 . -7/20} =
5/8 - (-7/60) =
89/120
-1/4 + 3/5 =
Denominador común: 20
Solo el numerador es negativo:
20 : 4 = 5 . -1 = -5
20 : 5 = 4 . 3 = 12
-5 + 12 7
----------- = ------------
20 20
1/5 + 1/2 =
Denominador común: 10
10 : 5 = 2 . 1 = 2
10 : 2 = 5 . 1 = 5
2 + 5 7
--------- = --------
10 10
7/20 -7/10 =
Denominador común: 20
20 : 20 = 1 .7 = 7
20 : 10 = 2 . 7 = 14
7 - 14 -7
---------- = ----------
20 20
1/3 . -7/20 =
1 . -7 = -7
3 . 20 = 60
-7/60
5/8 - (-7/60) =
Denominador común: 120.
120 : 8 = 15 . 5 = 75
120 : 60 = 2 . -7 = -14
75 - (-14) 75 + 14 89
------------- = ------------- = ---------------
120 120 120