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九年义务教材六年制小学数学第二册第１２页的例４、例５，是一年级第一次出现的“求另一个加数是多少”的减法文字应用题。它对学生巩固和灵活运用“求两个数的和”用加法计算；“求另一个加数”用减法计算；掌握加减法应用题的基本结构；进一步学习应用题知识，起着打基础的?
Example 4 and Example 5 on page 12 of the nine-year compulsory education textbook of the six-year primary school mathematics are the subtraction literal application questions that appear for the first time in the first grade. It is for students to consolidate and flexible use of “seeking sum of two numbers” with addition; “seeking another addend” subtraction; master addition and subtraction of the basic structure of the application; further learning application knowledge, playing a foundation of?