把一个高是10厘米的圆柱体沿着高垂直切开，分成若干份，拼成一个和它体积相等的近似长方体，这个面积不变的长方体的底面周长却比圆柱的底面周长增加了20厘米．原来这个圆柱体的体积是多少？
直接写得数．×= ﹣= ×= ×=÷= ÷= ÷= ÷=
直接写得数÷= ×= ﹣= ×1.4=12×= 24×= += 0÷=
直接写得数= = 3÷= == = = == =
直接写得数．×16= 12÷= 0.3×=×÷= ÷= 0×+=×÷×=
口算．2×= 1.5÷= ×0.8= ×9= 1.2÷=÷2= ÷= 2.4÷= 1÷5= ÷3=
×
﹣
= 
×
= 
×
=
÷
= 
÷
= 
÷
= 
÷
=
÷
= 
×
= 
﹣
= 
×1.4=
= 24×
= 
+
= 0÷
=
= 
= 3÷
= 
=
= 
= 
= 
=
= 
=
×16= 12÷
= 0.3×
=
×
÷
÷
= 0×
+
=
×
÷
×
= 1.5÷
= 
×0.8= 
×9= 1.2÷
=
÷2= 
÷
= 2.4÷
= 1÷5
= 
÷3=
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