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在解题时,常遇到某些项的系数为字母且待定.解这类题往往要运用一些概念、性质、法则等条件来求解.现举四例: 例1 在解方程组时,学生甲求解时把系数p所代表的数写错了,求得方程组的解是x=-1,y=5;学生乙把系数q看错,求得方程组的解是x=7,y=2,试求p、q的值.
When solving a problem, it is often encountered that the coefficients of certain items are letters and are to be determined. Solutions to such problems are often solved by applying some concepts, properties, rules, and other conditions. There are four cases: Example 1 When solving a system of equations, students When solving a problem, the number represented by the coefficient p is wrongly written, and the solution of the equation group is x=-1, y=5; student B misreads the coefficient q, and the solution of the equation group is x=7,y. = 2, try p, q values.