北师大版 二年级上册 第八单元 69的乘法口诀,53,93,12,13,14,15,16,17,18,19,21,23,25,26,28,29,31,32,33,34,36,37,38,41,42,43,44,45,47,49,59,64,65,66,67,68,73,74,75,76,88,51,52,54,56,82,83,84,85,86,61,62,71,78,79,57,87,91,92,95,96,98,99,观察下表，你能发现什么？与同伴说一说。,
