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义务教育六年制小学数学第八册第一单元例2“三步计算的文字题”，是在前一册学过的两步计算文字题的基础上进行教学的。通过本例教学，使学生初步学会列综合算式解答三步计算的文字题。教学重点是根据四则运算的顺序和使用小括号列综合算式；难点是三步计算文字题的分析解答过
Compulsory education Six-year primary school mathematics eighth unit first unit Example 2 “three-step calculation of the text problem” is based on the first one learned two-step calculation of text questions on the basis of teaching. Through this case teaching, enable students to initially learn the column comprehensive formula to answer three-step calculation of the text question. Teaching emphasis is based on the order of the four operations and the use of parentheses column synthesis formula; difficulty is three-step calculation of the text question analysis