一个圆柱体橡皮泥，底面积是12平方厘米，高4厘米，把它捏成：（1）底面积不变的圆锥，圆锥的高是多少？（2）高不变的圆锥 ，圆锥的底面积是多少？（3）底面积是8平方厘米的圆锥，高是多少？
直接写得数×4= 6﹣= ÷= 6÷1%=×0÷= 1÷= ×= 10+×=0.99×9+0.99= ×5×7=
直接写得数．10÷1%= 6.3×= 0×3.5= 4.2÷=1.125×8= ÷= 12﹣9.8= 3.6×2.5=1.25××8= ×2÷×2=
390×0.02= ﹣= 5﹣1.4﹣1.6= 0.9﹣0.26=81÷= 4×（0.6+1.9）= 0.23×400= ×=﹣+= 0.9+99×0.9=
口算．1.4×3= = = 1.8+0.32== 36.1÷5.9≈ 298×31≈ 499+203≈
直接写出下面各题的结果．28×2= 1.8+2.9= 4.8÷12= 10﹣0.9=0.25×4= ﹣= += ×=1﹣75%= ÷=
×4= 6﹣
= 
÷
= 6÷1%=
×0÷
= 1÷
= 
×
= 10+
×
=
×5×7=
= 0×3.5= 4.2÷
=
÷
= 12﹣9.8= 3.6×2.5=
×8= 
﹣
= 5﹣1.4﹣1.6= 0.9﹣0.26=
= 4×（0.6+1.9）= 0.23×400= 
×
=
﹣
+
= 0.9+99×0.9=
= 
= 1.8+0.32=
= 36.1÷5.9≈ 298×31≈ 499+203≈
﹣
= 
+
= 
×
=
÷
=
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