竖式计算。274×8 204×7
1--
口算。+= -= += - +=0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
×= ÷3=÷= －=3÷15= ＋0.25=1÷= 85%－15%=10÷10%= 5×÷5×=
脱式计算下面各题。4÷-0.6 ×÷（+）÷ ÷[1÷(-)]
÷＋×
-
+
= 
-
= 
= 
-
+
=
×
= 
÷3=
÷
= 
－
÷5×
-0.6 
×
÷
+
）÷
÷[1÷(
-
)]
÷
＋
×
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