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一、情况严重目前我們的高三学生在数字运算方面,存在着极其严重的問題。主要表現在: (1) 运算方法不合理。例如某生在解“将三个直径分别为6cm,8cm,和10cm的三个小球熔成一个大球,試求大球直径”。一題时,他作出了如下的解答: 設三个小球体积分別为V_1,V_2,和V_3。大球为V; V_1=4/3πr_1~2=4/3×3.14×3~3=110.14, V_2=4/3πr_2~3=4/3×3.14×4~3=265.813, V_3=4/3πr_2~3=4/3×3.14×5~3=145.37, ∵ V=V_1+V_2+V_3, ∴ 4/3πr~3=110.14+265.813+145.37=
I. Severe Situation At present, there are extremely serious problems in the digital arithmetic of our senior students. Mainly in: (1) The calculation method is unreasonable. For example, a student in the solution “melts three small balls with diameters of 6cm, 8cm, and 10cm into one big ball and tries to find the diameter of the big ball”. In one question, he made the following answer: Let three ball volumes be V_1, V_2, and V_3. The big ball is V; V_1=4/3πr_1~2=4/3×3.14×3~3=110.14, V_2=4/3πr_2~3=4/3×3.14×4~3=265.813, V_3=4/3πr_2 ~3=4/3×3.14×5~3=145.37, ∵ V=V_1+V_2+V_3, ∴ 4/3πr~3=110.14+265.813+145.37=