核心提示：一、口算（20分)★★
12 - 7 = 14 - 5 = 4 + 9 = 9 + 8 =
15 - 5 = 18 - 9 = 59 - 9 = 50 + 8 =
人教版一年级下册数学期
一、口算（20分)★★
12 - 7 = 14 - 5 = 4 + 9 = 9 + 8 =
15 - 5 = 18 - 9 = 59 - 9 = 50 + 8 =