在一个圆柱形水桶里，要放进一段截面半径是5厘米的圆钢．先把它全放入水里，桶里的水面就上升9厘米；再把水中的圆钢露出8厘米长，水面就下降4厘米，求这段圆钢的体积．
直接写出下面各题得数． 15×=﹣=+=×25%= 7÷=÷=÷10=×= 1÷÷=÷×=
直接写出得数．×=+=÷= 1﹣=÷3= 8×25%=÷=﹣20%=
直接写出得数： 9÷= ；÷= ；×= ；×0÷= ．
直接写得数×=×= 21×= 6÷= 10÷=+0.5= 1﹣= 2÷0.2=÷=：=
直接写出得数． 100÷10%= 12÷= 6.3÷0.07= 10﹣=÷22=+=×=÷=×= 24×=
=
﹣
=
+
=
×25%= 7÷
=
÷
=
÷10=
×
= 1÷
÷
÷
×
=
×
=
+
=
÷
= 1﹣
=
÷3= 8×25%=
÷
=
﹣20%=
= ；
÷
×
= ；
×0÷
= ．
×
=
×
= 21×
= 6÷
=
=
+0.5= 1﹣
= 2÷0.2=
÷
=
：
=
= 6.3÷0.07= 10﹣
=
÷22=
+
=
×
=
÷
=
×
= 24×
=
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