直接写出得数．
0.6÷0.2= 6﹣0.4= 8×0.1= 4.5×0.4=
= 
= 
= 
÷
=
= 526+298= 302×39≈ 642÷80≈
直接写出得数．
0.6÷0.2= 6﹣0.4= 8×0.1= 4.5×0.4== = = ÷== 526+298= 302×39≈ 642÷80≈
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