Răspuns:
(14+84):7=98:7=14
(14+84):7=(14:7)+(84:7)=2+12=14
(12+32):2=44:2=22
(12+32):2=(12:2)+(32:2)=6+16=22
(64:32):4=96:4=24
(64:32):4=(64:4)+(32:4)=16+8=24
(12+32+24):2=68:2=34
(12+32+24):2=(12:2)+(32:2)+(24:2)=6+16+12=34
(15+60+21):3=96:3=32
(15+60+21):3=(15:3)+(60:3)+(21:3)=5+20+7=32