的倒数里减去
除
的商，差是多少？ 
÷
= 0.24×300= 4.2÷
= 
×+
÷5=
= 0.25×8×125%=  ×8= |  ﹣ = |  ÷3= | 21× = |
2÷ = |  ÷ = |  × = |  + = |
÷195= ；（2）195÷195= 
+
+
+…+
+
= ．  ×6= |  × = |  ÷5= |  ﹣ = |
 + = |  × = | 3÷ = |  + × ． |
（21）
（22）
= 
×
= 12÷
= 
÷15= 2.5×=÷= 
×
= 
÷5= （
+
）×56= 
×2= 
×
= 3.14×3= 0.52=
= 
÷
= 
×
= 3.14×42= 
×÷×=
= 102= 0.012= 
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