年、月、日日一二三四五六12345678910111213141516171819202122232425262728293031日一二三四五六123456789101112131415161718192021222324252627282930日一二三四五六12345678910111213141516171819202122232425262728293031日一二三四五六123456789101112131415161718192021222324252627282930日一二三四五六12345678910111213141516171819202122232425262728293031日一二三四五六123456789101112131415161718192021222324252627282930日一二三四五六12345678910111213141516171819202122232425262728日一二三四五六12345678910111213141516171819202122232425262728293031日一二三四五六12345678910111213141516171819202122232425262728293031日一二三四五六123456789101112131415161718192021222324252627282930日一二三四五六12345678910111213141516171819202122232425262728293031日一二三四五六12345678910111213141516171819202122232425262728293031把你观察到的填在表格里月份123456789101112天数讨论:1、一年共有多少个月
2、每个月分别是多少天
月份天数12345678910111231283130313031