如图，一个六边形的6个内角都是120°，其连续四边的长依次是1厘米、9厘米、9厘米、5厘米．求这个六边形的周长．
直接写出得数．= = 1﹣=4﹣= = == =
计算下面各题．．
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++﹣+﹣+﹣．
1﹣．
= 
= 1﹣
=
= 
= 
=
= 
=
．
=
=
=
=
=
=
=
=
=
+
+
﹣
+
﹣
+
﹣
．
．
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