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31 - 29 :{1 + 112 : [ 0 : 5 + 20 : (2 x 5 x 2 ) x 4 + 7 x 0]}
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Răspuns :

Delia17
31-29:{1+112:[0+20:20×4+0]}= 31-29:{1+112:[0+1×4+0]}= 31-29{1+112:[0+4+0]}= 31-29[1+112:4]= 31-29:(1+28)= 31-29:29= 31-1= 30
31-29:{1+112:[0:5+20:(2•5•2)•4+7•0]}= 31-29:{1+112:[0:5+20:(10•2)•4+7•0]}= 31-29:[1+112:(0:5+20:20•4+7•0)]= 31-29:[1+112:(0+1•4+0)]= 31-29:(1+112:4)= 31-29:(1+28)= 31-29:29= 31-1= 30

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