(+)*(23-15)*-
В первом там (4/5+1/6)
По действиям 2: 4/5=2*5/4=1*5/2=5/2=2 1/2 2 1/2+1/6=2 3/6+1/6=2 4/6=2 2/3 23 2/3-15 5/9=23 6/9-15 5/9=8 1/9 2 2/3*8 1/9*45/58=8/3*73/9*45/58=8/1*73/9*15/58=8*73/3*5/58= =4*73/3*5/29=1460/87=16 68/87 16 68/87-1/2=16 136/174- 87/174=16 49/174