美术课上老师让同学们用橡皮泥捏出自己喜欢的形状，小明捏出一个底面半径为1厘米、高为3厘米的圆柱体，他想再把它捏成底面半径为2厘米的圆锥体，应该捏多高？
直接写得数．
2/5﹣1/10= 16÷2/7= 1/2÷3/5= 1/7×1/7= 1/4×2/5=
5/6﹣1/2= 2/7×0+9= 3/5×1/21= 2/7×21= 14/17÷7=
1÷5﹣1/5= 4/7+4/7×6=（1/8+4/8）×4/5= 6×5÷1/2= 1/9÷1/3=
5/9×1/5÷5/9×1/5=
直接写出得数．
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= 1﹣1%=
直接写出得数．
×12=
÷
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×=
÷=
÷1=
﹣
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+
= 20÷
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×21=
÷
= 2÷10%= 16×25%=
直接写得数：
2.7﹣
= 5.6÷0.08=
÷
= 36×10%=
=
×9×
=
﹣0÷
+1= 1÷
﹣÷1=
小时：120分= 7﹣7÷8=
﹣2.7= 14×
=
÷5=
1
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﹣
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=
= 24
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0.25×8= 3.4﹣
﹣
=
+0.5=
10.5﹣1.05=
= 10.01÷10%=
1.5×
=
80%= 1×9
=
3×
=