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efectuiaza dupa model 46+4=40 =40+10 =50

Răspuns :

42+8=22+28=50
60-10=40+10=50
32+18=38+12
100-50=0+50
20+30=36+14=50
etc.
42+8=22+28=50
60-10=40+10=50
32+18=38+12
100-50=0+50
20+30=36+14=50