直接写得数：+= ﹣= ﹣= ﹣= 1﹣=+= += += ﹣= 2﹣=
用竖式计算下面各题 800﹣260= 680+270= 74﹣16= 25+36=
□○□○□=□ ．
比一比，算一算．
列竖式计算下面各题． 99﹣14= 20+16= 75+7= 72﹣27=
+
= 
﹣
= 
﹣
= 
﹣
= 1﹣
=
+
= 
+
= 
+
= 
= 2﹣
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