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义务教育六年制小学课本第十册中,比现行教材增添了不少有利于发展学生智能的思考题。现对这些思考题的解题思路作如下的探讨: 1.一个零件形状大小如右图。算一算,它的体积是多少立方厘米,表面积是多少平方厘米。(P49) [分析与解答]此题求体积的方法较多,一般用分解求两个基本形体体积的和(差)方法求解。这里只介绍几种简便、新颖的解法: 见图(1) 这1、零件的体积是:(5+2)×10×1.5=105(立方厘米)
Compulsory education six years of primary school textbooks in the tenth book than the current textbook adds a lot of thinking is conducive to the development of student intelligence. Now these questions to solve the problem of thinking as follows: 1. A part shape and size as shown on the right. Counting, how much its size is cubic centimeter, the surface area is how many square centimeters. (P49) [Analysis and Solution] There are many ways to find out the volume, and the solution is to find the sum of the two basic body volumes by the decomposition method. Here only introduce a few simple and novel solution: See Figure (1) This 1, the volume of the part is: (5 +2) × 10 × 1.5 = 105 (cm)