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对于一元二次方程的两根的非对称式求值问题,关键是利用条件把非对称式变为对称式与已知式,再利用根与系数的关系来解,怎么变呢?
The key to the problem of the asymmetrical evaluation of two unary quadratic equations is to use conditions to change the asymmetry to symmetry and known, and then use the relationship between the root and the coefficients to solve. How does this change?