一块边长8米的菜地，一边靠墙，其余三边围上竹篱笆．竹篱笆长多少？这块菜地的面积是多少？
直接写得数．+=﹣= 0.2﹣=+=﹣=+2÷9= 2﹣﹣= 1.55﹣= 1﹣﹣+= 0.5﹣﹣=
计算．===== 1﹣===
看图计算下面各题．+= +=
计算下列各题：========
观察下面各式，算一算，你能发现什么规律？+=+=+=×=×=×=
+
=
﹣
= 0.2﹣
=
+
=
﹣
=
+2÷9=
﹣
= 1.55﹣
+
=
=
=
=
=
= 1﹣
=
=
=
+
=
+
=
=
=
=
=
=
=
=
=
+
=
+
=
+
=
×
=
×
=
×
=
粤公网安备 44130202000953号