Question

помогите плиз
(4/20-7/8):(-7/45-2/9)

Answer 1

1) 4/20  -  7/8 = 1/5  -  7/8 =8/40  -  35/40 =  - 27/40
2) - 7/45  -  2/9 = -7/45  -  10/45 =  - 17/45
3) ( - 27/40) : ( - 17/45) = ( - 27/40)  *  ( - 45/17) =  243/136 = 1 107/136