先测量出每个图形的有关数据，在计算出每个图形的周长．（精确到厘米）
直接写出得数．= 15= = =0.33= = = =1﹣= = = =
×= 1÷= 4×60%= 0.875÷0.125=÷2= 10÷= ×3.6= 0×=
直接写得数．= = 1÷40%== = 72×25%==
直接写出下列题目的得数．7+66.3= ÷= ×÷=14÷= ÷20%= （+）×20=
口算．============
= 15
= 
= 
=
= 
= 
=
= 
= 
= 
=
×
= 1÷
= 4×60%= 0.875÷0.125=
= 
×3.6= 0×
=
= 
= 1÷40%=
= 
= 72×25%=
=
÷
= 
×
÷
=
= 
÷20%= （
+
）×20=
=
=
=
=
=
=
=
=
=
=
=
=
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