用硬纸板做一个长方体盒子，长6分米，宽40厘米，高3分米，至少需要多少硬纸板？
直接写得数．×= ×3= 0÷= ÷= ×=×39= ×= ÷= ÷= ÷3=
直接写数对又快！= = = == = = == =
直接写出得数10﹣0.1= += 1÷= 14﹣﹣=×= ﹣= ×= （+）×72=
直接写出得数．×= 1÷0.9= ÷0.8= ×9÷×9=5.6÷= ×= 0÷= ×=
直接写得数．×= ÷14= 26×= ÷28= 12×=×= ×= ×24= ÷= ÷=
×
= 
×3= 0÷
= 
÷
= 
×
=
×39= 
×
= 
÷
= 
÷
= 
÷3=
= 
= 
= 
=
= 
= 
= 
=
= 
=
+
= 1÷
= 14﹣
﹣
=
×
= 
﹣
= 
×
= （
+
）×72=
×
= 1÷0.9= 
÷0.8= 
×9÷
= 
×
= 0÷
= 
×
=
×
= 
÷14= 26×
= 
÷28= 12×
=
×
= 
×
= 
×24= 
÷
= 
÷
=
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