Răspuns :
(78÷6+13×9)÷10+7 =
= (((78 ÷ 6) + (13 × 9)) ÷ 10) + 7 =
= ( 13 + 117):10 + 7 =
= 130:10+7 =
= 20
= (((78 ÷ 6) + (13 × 9)) ÷ 10) + 7 =
= ( 13 + 117):10 + 7 =
= 130:10+7 =
= 20