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4+5 2/5+2 1/4= 4+5 8/20+ 2 5/20 = 11 i 13/20
2.2 3/8 - 1 5/8= 19/8 - 13/8 = 6/8 = 3/4
4 1/3- 5/6= 13/3 - 5/6 = 26/6 - 5/6= 21/6= 3 3/6 = 3 1/2
8 1/2 - 6 5/7= 8 14/14 - 10/14 = 4/14 = 2/7
3. 1 5/7* 4 2/3 = 12/7 * 14/3 = 4/1 * 2/1= 8
2*2*1/4= 4*1/4 = 1
4*3 1/8*3/10= 4/1*25/8*3/10= 1/1*5/2*3/2= 5/2*3/2=15/4= 3 3/4
5. 3:2 1/4 = 3/1:9/4= 3/2*4/9=1/1*2/3=2/3
7 1/2:1 7/8= 15/2:15/8=15/2 * 8/15= 1/1* 4/1=4/1= 4
1 1/2: 2 1/4= 3/2 : 9/4= 3/2*4/9=1/1*2/3=2/3