a×b=______×______; 5×c=c×______; a×b×c=a
题型:填空题
问题:
a×b=______×______;
5×c=c×______;
a×b×c=a×(______×______);
a×(5+b)=______+ab;
(a+b)×c=______×______+______×______;
(m+x)+n=m+(______+______).
a×b=______×______;
5×c=c×______;
a×b×c=a×(______×______);
a×(5+b)=______+ab;
(a+b)×c=______×______+______×______;
(m+x)+n=m+(______+______).