下图是一个锯齿状的零件，每一个锯齿的两条线段都长2厘米，求这个零件的周长．
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
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=
=
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=
×
= 1÷
= 4×60%= 0.875÷0.125=
=
×3.6= 0×
=
=
= 1÷40%=
=
= 72×25%=
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÷
=
×
÷
=
=
÷20%=（
+
）×20=
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=
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=
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