Решить : з a) -7/24 + 5/18 б) 5/42 + (-11/63) b) -1 + 4/9 г) 1 9/20 + (-1 8/15)

A) -7/24 + 5/18=-21/72+20/72=-1/72
Б) 5/42 + (-11/63)=5/42-11/63=15/126-22/126=-7/126=-1/18
B) -1 + 4/9=-5/9
Г) 1 9/20 + (-1 8/15)=29/20-23/15=87/60-92/60=-5/60=-1/12

А) -7/24 + 5/18 = -21/72 + 20/72 = -1/72
б) 5/42 + (-11/63) = 15/126 - 22/126 = -7/126 = -1/18
в) -1 + 4/9 = -9/9 + 4/9 = -5/9
г) 1 9/20 + (-1 8/15) = 1 54/60 - 1 32/60 = 22/60 = 11/30