直接写得数．
1÷
= 
×
= 
+
= 2﹣
=
4.2×0.5= 0.25×0.6= 246+198= 
﹣
=
= 
= 
= 84.6+4=
= 10÷0.5= 
= 603×39≈
4980÷51≈ 9.3÷0.03= 
÷2÷= 9﹣
﹣
．
直接写得数．
1÷= ×= += 2﹣=
4.2×0.5= 0.25×0.6= 246+198= ﹣== = = 84.6+4== 10÷0.5= = 603×39≈
4980÷51≈ 9.3÷0.03= ÷2÷= 9﹣﹣．
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