题目内容
根据乘法分配律,在横线上填上适当的数或字母.
(14+________)×________=14×55+9×55
(36+28)×7=________×________+________×________
68×(________+________+42)=________×________+________×________+________×________
76×4=________×4+________×4
52×30+48×30=________×________