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Răspuns :

Mikkka
(16+20) :2= 16:2 +20:2=8+10=18
(12+36) :3=12:3+36:3=4+12=16
(21+63) :7=21:7+63:7=3+9=12
(24+60) :6=24:6+60:6=4+10=14
(9+90) :9= 9:9+90:9=1+10=11

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