Question

вычислите : 5/7* (21/20-7/30)-16/21:8/7=

Answer 1

5/7* (21/20-7/30)-16/21:8/7= -1/12

1) 21/20-7/30=63/60-14/60=49/60
2) 16/21:8/7=16/21·7/8=2/3
3) 5/7·49/60=7/12
4) 7/12-2/3=7/12-8/12= -1/12