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一、计算法即通过认真计算来判断命题的正误。【例1】边长分别为3分米、8分米的两个正方形的面积比是9:1 6。()用计算的方法:边长3分米正方形面积是3×3=9(平方分米);边长8分米正方形面积是8×8=64(平方分米)。那么,这两个正方形的面积比是9:64,所以,这道题是错的。二、对比法即利用有关正确的概念与命题进行比较来判断命题的正误。
First, the calculation method that is determined by careful calculation of the proposition is correct. [Example 1] The area ratio of two squares with side lengths of 3 and 8 respectively is 9: 16. () Calculated by the method: side length of 3 decimeter square area is 3 × 3 = 9 (square decimeter); side length 8 decimeter square area is 8 × 8 = 64 (dm). Well, the area ratio of these two squares is 9:64, so this question is wrong. Second, the contrast method that is the use of the correct concept and proposition to compare the right and wrong to determine the proposition.