1
1)2 5/9-1 20/21=2 35/63-1 60/63=1 98/63-1 60/63=38/63
2)38/63:1 8/49=38/63*49/56=(2*7)/(9*3)=14/27
3)1 8/9:6=17/9*1/6=17/54
4)14/27+17/54=28/54+17/54=45/54=5/6
2
1)1 17/18*1 13/14=(35*27)/(18*14)=(5*3)/(2*2)=15/4=3 3/4
2)2 5/8:1 19/20=(21*20)/(8*39)=(7*5)/(2*13)=35/26=1 9/26
3)3 3/4-1 9/26=3 39/52-1 18/52=2 21/52
4)2 25/78-1 1/26=2 25/78-1 3/78=1 22/78=1 11/39
5)2 21/52:1 11/39=(125*39)/(52*50)=(5*3)/(4*2)=15/8=1 7/8