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利用待定系数法可将一元四次多项式分解为两个二次多项式的乘积,通过解两个一元二次方程达到求解四次方程的目的.
The coefficient of undetermined coefficient can be used to decompose the quadratic polynomial of one yuan into the product of two quadratic polynomials. By solving two quadratic equations, the quadratic equation can be solved.