30-23,1:(5 7дробь20-4 6 дробь 35

Question

30-23,1:(5 7дробь20-4 6 дробь 35

Answer 1

1)7 7/20-4 6/35=5 49/140-4 24/140=1 25/140=1 5/28
2)23 1/10:1 5/28=231/10*28/33=7/10*28/1=196/10=19,6
3)30-19,6=10,4