(1\13-2 3\4)*26=1/13-11/4=((1*4-11*13)/52)*26=139/52*26=139/2=69,5
6\5:4\11=(6*11)/5*4=33/10=3,3
1+1/2=1 1/2
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(1\13-2 3\4)*26=1/13-11/4=((1*4-11*13)/52)*26=139/52*26=139/2=69,5
6\5:4\11=(6*11)/5*4=33/10=3,3
1+1/2=1 1/2