0.1×208= 7.2÷36= 4.8÷16= 1.3×50=
0.5×20= 0.81÷0.09= 4.2÷4= 0.98÷7=
0.39÷1.3= 2.5×40= 4.7×2= 0.4×0.5=
0.1×208= 7.2÷36= 4.8÷16= 1.3×50=
0.5×20= 0.81÷0.09= 4.2÷4= 0.98÷7=
0.39÷1.3= 2.5×40= 4.7×2= 0.4×0.5=
= 
= 
= 
= 
=
= 
= 
= 100×
= （
）×0=
米 ．
是72，这个数是多少？
÷
= 
×
×4= 0.5﹣
=
= 1÷
= 
+
= 
×
=
÷8= 12×40%=
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