口算．
0.4×0.25= 3.2÷0.8= 1.25×7×0.8= 1÷8=
0.2×0.9+0.6×0.2= 6.2÷0.62= 2﹣2÷5= 1﹣0.08=
0.5×0.1÷0.5×0.1= 0.01÷0.001×0.1=
口算．
0.4×0.25= 3.2÷0.8= 1.25×7×0.8= 1÷8=
0.2×0.9+0.6×0.2= 6.2÷0.62= 2﹣2÷5= 1﹣0.08=
0.5×0.1÷0.5×0.1= 0.01÷0.001×0.1=
，苹果树和梨树占总面积的
．梨树的面积占总面积的几分之几？
= 
= 
=
= 
= 
=
+
+
﹣
﹣
1﹣
﹣1
+
﹣
﹣
﹣
1﹣
+
﹣
+
．
=
=
=
，又看了全书的 
，小红看了全书的几分之几？还剩下全书的几分之几没有看？
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