直接写得数．
+
= 
+= 
﹣
= 10﹣4.8﹣3.2=
1﹣
= 0.5×0.2÷0.5×0.2= 1﹣
﹣
= 
﹣
=
0.125×0.25×32= 7﹣6.38= 
+
= 3.9+6.1﹣3.9+6.1=
直接写得数．+= += ﹣= 10﹣4.8﹣3.2=
1﹣= 0.5×0.2÷0.5×0.2= 1﹣﹣= ﹣=
0.125×0.25×32= 7﹣6.38= += 3.9+6.1﹣3.9+6.1=
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