(20-13)*(20+13)/(31-24)*(31+24)= 7*33/7*55= 3/5
(37-47)(37+47)/(72-12)*(72+12)= -10*84/60*84= -1/6
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(20-13)*(20+13)/(31-24)*(31+24)= 7*33/7*55= 3/5
(37-47)(37+47)/(72-12)*(72+12)= -10*84/60*84= -1/6