1,75=1 3/4
2,2=2 1/5
3,5=3 1/2
1) 6 1/8 - 1 3/4 = 5 (1-6)/8 = 4 (9-6)/8 =4 3/8
2) 5 6/11 - 3 1/2 = 2 (6*2-1*11)/22=2 1/22
3) 2 1/5*2 1/22=11/5*45/22=9/2=4 1/2
4) 9- 4 1/2 = 4 1/2
5) 4 3/8 : 4 1/2 =35/8:9/2=35/8*2/9=35/36
6) 35/36*1 2/7=35/36*9/7=5/4=1 1/4=1,25
(6 1/8-1,75):(9-2,2*(5 6/11-3,5))*1 2/7=1 1/4
6 1/8-1,75=6 1/8-1 75/100=6 1/8-1 3/4=49/8-7/4=49/8-14/8=35/8=4 3/8
5 6/11-3,5=5 6/11-3 5/10=5 6/11-3 1/2=61/11-7/2=122/22-77/22=45/22=2 1/22
2,2*2 1/22=2 2/10*2 1/22=22/10*45/22=45/10=4 5/10=4 1/2
9-4 1/2=18/2-9/2=9/2=4 1/2
4 3/8:4 1/2=35/8:9/2=35/8*2/9=35/36