一个正方体的棱长是a，棱长之和是 。
×= 0×= ÷= = = =
直接写出得数×3= ×16= ×= （+）×4=×+×= += ÷3= 4÷=
= = = == = = == = = == = = =
×1= 52﹣42= 0.75﹣0.5= ×= ÷= 125×0.08=0.5+0.02= ÷= ÷= 0.15×6= 12÷0.3= 0÷=
直接写得数．×16= 12÷= 24×= ×÷=1÷= ÷15= ÷= ×÷×=
×
= 0×
= 
÷
= 
= 
= 
=
×3= 
×16= 
×
= （
+
）×4=
×
+
×
= 
+
= 
÷3= 4÷
=
= 
= 
= 
=
= 
= 
= 
=
= 
= 
= 
=
= 
= 
= 
=
×1= 52﹣42= 0.75﹣0.5= 
= 
÷
= 125×0.08=
÷
= 0.15×6= 12÷0.3= 0÷
=
×16= 12÷
= 24×
= 
×
÷
= 
÷15= 
÷
= 
×
÷
×
=
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