(8 1/4-2 5/16)*4/25=0,95
1)8 1/4- 2 5/16=8 4/16-2 5/16=6-1/16=5 16/16-1/16=5 15/16
2)5 15/16*4/25=95/16*4/25=19/4*1/5=19/20=0,95
1 17/28*14/9+14/25*5/7=2,9
1)1 17/28*14/9=45/28*14/9=5/2
2)14/25*5/7=2/5
3)5/2+2/5=25/10+4/10=29/10=2,9
11/12*7+23/48*4-3 1/3=5
1)11/12*7/1=77/12
2)23/48*4/1=23/12
3)77/12+23/12=100/12=25/3=8 1/3
4)8 1/3-3 1/3=5