Răspuns :
[81:9+7×(2:2+6):7]:2=
=[81:9+7×(1+6):7]:2=
=(81:9+7×7:7 ):2=
=(9+7×7:7):2=
=(9+49:7):2=
=(9+7):2=
=16:2=
=8
=[81:9+7×(1+6):7]:2=
=(81:9+7×7:7 ):2=
=(9+7×7:7):2=
=(9+49:7):2=
=(9+7):2=
=16:2=
=8