5/6*9/15-5/12*4/15; 7/18*9/14+1/3*6/7; 9/20*2/3+5/14*7/25 ; 3 3/4*2/5-3 6/25*5/27; 2 2/5*5/6-3/4*1 2/3; 1 17/28*7/9+14/25*5/7.

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