14 7/15-3 3/23*23/27-1 1/5*1/6=11 3/5
1) 3 3/23*23/27=72/23*23/27=72/27
2) 1 1/5*1/6=6/5*1/6=1/5
3) 14 7/15-72/27=217/15*72/27=1953/135-360/135=1593/135=531/45
4) 531/45-1/5=531/45-9/45=522/45=11 6/10=11 3/5
(5 8/9:1 17/36+1 1/4)*5/21=1 1/4
1) 5 8/9:1 17/36=53/9:53/36=53/9*36/53=36/9=4
2) 4+1 1/4=16/4+5/4=21/4
3) 21/4*5/21=5/4=1 1/4
(-3,25-2,75):(-0,6)+0,8*(-7)=4,4
1) -3,25-2,75=-6
2) -6:(-0,6)=10
3) 0,8+(-7)=-5,6
4)10+(-5,6)=4,4
(-1 3/8-2 5/12):5 5/12=-1 2/5
1) -1 3/8-2 5/12=-11/8-29/12=-33/24-58/24=-91/24
2) -91/24: 5 5/12=-91/24: 65/12=-91/24*12/65=-1 4/10=-1 2/5