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“下面4个图形的面积都是36dm~2。用这些图形分别卷成圆柱,哪个圆柱的体积最小?哪个圆柱的体积最大?你有什么发现?(单位:dm)(人教版六年级数学下册练习五)一线教师说到这一题,无一例外的都认为很难。难的原因不是因为这道题有多种卷法,也不是因为这道题是根据圆柱的底面周长与高求圆柱的体积,更不是因为这道题所要发现的规律。之所以说这道题很难,原因在
”The following four graphics area is 36dm ~ 2. Use these graphics were rolled into a cylinder, which column the smallest volume? Which column the largest volume? What do you find? (Unit: dm) Mathematics book exercise five) front-line teacher said this question, without exception, that is difficult because the problem is not a variety of volume method, nor is it because the problem is based on the cylindrical bottom circumference And the high volume of the cylinder, but not because of the problem to be found in the law.The reason why the problem is difficult, because