列竖式计算．402×22= 450×89= 675÷27= 2408×17= 750÷30= 478÷32=
怎样简便怎样算．++=+++=﹣（+）=
．
﹣= += += ﹣=﹣= ﹣= += ﹣=1﹣﹣= +=
+= ﹣= 7.2÷0.3= ﹣1=+0.2= 0.54÷9= ﹣= ﹣=﹣= += 1÷0.25= += 0.67+0.3= 0.38×2= 8.1÷0.09= 2﹣= 12×0.5= 2.5×0.6=
计算．（能简算的要简算） ﹣（+） +（﹣） ．
+
+
=
+
+
+
=
﹣（
+
）=
．
﹣
= 
+
= 
+
= 
﹣
=
﹣
﹣
= 
+
= 
﹣
=
﹣
= 
+
=
+
﹣
= 7.2÷0.3= 
﹣1=
+0.2= 0.54÷9= 
﹣
= 
﹣
=
﹣
= 
+
= 1÷0.25= 
+
= 
= 12×0.5= 2.5×0.6=
﹣（
+
） 
+（
﹣
） 
．
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