一个无盖的圆柱形铁皮水桶，从里面量底面半径是2分米，高是4.5分米．这个木桶的容积是多少？
直接写得数．×16= 12÷= 0.3×=÷= 1÷= 0×===
直接写得数 4÷= 0×=÷=×1.4=×= 0÷=×10= 30×0.05=
直接写出得数．========
口算． 4.2÷=×3=÷5=（+）×72=×12=×1.8=÷=
========
×16= 12÷
= 0.3×
=
÷
= 1÷
= 0×
=
=
=
= 0×
=
÷
×1.4=
×
=
×10= 30×0.05=
=
=
=
=
=
=
=
=
=
×3=
÷5=（
+
）×72=
×12=
÷
=
=
=
=
=
=
=
=
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