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我在教学工作中和参加劳动生产时发現了一些数学問題。現将关于“柱体体积”方面的几个問题整理介紹如下,请同志們指正。 1.求柱形物体的此重:耐火砖是我們学校办工厂的产品,试求其一块砖的比重。解。耐火砖的形状是长方体,要先量其三度。设三度各为a,b,c(厘米),求出其体积V=abc,再称其重量設为M(克),所以,所求的比重d=M/V(克/厘米~3)。 2.計算修筑围墙的土方:在操埸边有一段32米长的围墙倒了,准备把它重新修筑起来,其纵断面的尺寸如图1,要求出其土方数以为劳动时分
I found some math problems in teaching work and participating in labor production. Here are some of the issues relating to the “volume of cylinders” summarized below. Please correct them. 1. Find the weight of a cylindrical object: Firebrick is a product of our school-run factory. Try to find the proportion of a brick. solution. The shape of the firebrick is rectangular, and it must be measured first. Let three degrees be a, b, c (centimeters), find its volume V = abc, and then call its weight as M (grams), so the required specific gravity d = M/V (g/cm~3 ). 2. Calculate the earthwork for the construction of the wall: A 32-meter-long wall is down at the abutment and is ready to be rebuilt. The dimensions of its longitudinal section are shown in Figure 1. It requires the number of earthwork to be considered as the working hour.