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((6 1/2-1 3/4):2 1/2)/((7-6 2/5)*3 1/3)-(1/2+3/4-5/12)/(3 7/11+6 4/11) = 13/15
1) 6 1/2-1 3/4 = 13/2 - 7/4 = 26/4 - 7/4 =19/4
2) 19/4:2 1/2= 19/4: 5/2= 19/4*2/5=19/10
3) 7-6 2/5 = 6 5/5 - 6 2/5 = 3/5
4) 3/5*3 1/3= 3/5*10/3=2
5) 19/10:2 = 19/10:2/1 = 19/10*1/2=19/20
6) 1/2+3/4-5/12 = 6/12+9/12-5/12=10/12 = 5/6
7) 3 7/11+6 4/11 = 9 11/11 = 10
8) 5/6:10 = 5/6:10/1= 5/6*1/10=1/12
9) 19/20 - 1/12 = 57/60 - 5/60 = 52/60 = 13/15
1) 6 1/2-1 3/4 = 13/2 - 7/4 = 26/4 - 7/4 =19/4
2) 19/4:2 1/2= 19/4: 5/2= 19/4*2/5=19/10
3) 7-6 2/5 = 6 5/5 - 6 2/5 = 3/5
4) 3/5*3 1/3= 3/5*10/3=2
5) 19/10:2 = 19/10:2/1 = 19/10*1/2=19/20
6) 1/2+3/4-5/12 = 6/12+9/12-5/12=10/12 = 5/6
7) 3 7/11+6 4/11 = 9 11/11 = 10
8) 5/6:10 = 5/6:10/1= 5/6*1/10=1/12
9) 19/20 - 1/12 = 57/60 - 5/60 = 52/60 = 13/15
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