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解决关于两个一元二次方程有且只有一个公根的问题的途径通常有两条:一条是消去二次项,另一条是消去常数项.下面举例说明.
There are usually two ways to solve the problem of the two unary quadratic equations with one and only one root: one is to cancel the quadratic term, the other is to eliminate the constant term. Here is an example to illustrate.