问题
填空题
根据运算定律填空.
(1)a+b+c=a+______
(2)a×b×c=a×______
(3)(a+b)=______+______
(4)ac-bc=______×c.
答案
(1)a+b+c=a+(b+c)
(2)a×b×c=a×(b×c)
(3)(a+b)=b+a
(4)ac-bc=(a-b)×c;
故答案为:(b+c),(b×c),b,(a-b).
根据运算定律填空.
(1)a+b+c=a+______
(2)a×b×c=a×______
(3)(a+b)=______+______
(4)ac-bc=______×c.
(1)a+b+c=a+(b+c)
(2)a×b×c=a×(b×c)
(3)(a+b)=b+a
(4)ac-bc=(a-b)×c;
故答案为:(b+c),(b×c),b,(a-b).