根据乘法的运算定律,在横线上填上合适的数,在○里填上运算符号(85+a)×b=______×______○______×______(17+______)×______=______×5○5×3b×a+25×______=(______○______)×b53×______+ⅹ×______=a×(53○______)
(1)(85+a)×b=85×b+a×b; (2)(17+3)×5=17×5+5×3; (3)b×a+25×b=(a+25)×b; (4)53×a+ⅹ×a=a×(53+x). 故答案为:85,b,+,a,b;3,5,17;b,a,+,25;a,a,+,x. |