《中小学数学》(初中版)2010年第4期,刊登了余勋金老师的《要注意题目中隐含的条件》一文,文中共列举了三个例题,笔者发现每道例题都有欠妥的地方.现提出并与同行研讨.余老师所列举的第一个例题及解答过程如下:1.若方程x~2+(2k+1)x+k~2-2=0的两实数根的平方和等于11,求k的值.正解设原方程两根为x_1,x_2. In the fourth issue of Mathematics for Primary and Secondary Schools (Junior Middle School) 2010, a book titled “Impressive Conditions to Be Noticed” was published by Professor Yu Xunjin. In the article, three examples were listed. The author found that each example has owed The proper place is proposed and discussed with peers. The first example problem and the solution process listed by Yu teacher are as follows: 1. If the equation x~2+(2k+1)x+k~2-2=0, the two real numbers are two real numbers. The sum of squares of the roots is equal to 11, and the value of k is found. The positive solution sets the original equation to x_1, x_2.