根据运算定律填上合适的字母、图形或数字。
○×(△+☆)=○×________+________×________
102×a=________×a+________×a
53+42=________+________
124+35+76 =(________+________)+35
35×43×4 =(________×________)×________
________×34+________×6=28×(________+________)
(18+26)×5 =18×________+26×________
103+28+97+72=(________+________)+(________+________)