设x^2=y,原方程变为y^2-5y+(4-k)=0,设此方程有实根α,β(0
鑻ユ柟绋?x2-1)(x2-4)=k鏈夊洓涓?潪闆跺疄鏍?涓斿畠浠?湪鏁拌酱涓婂?搴旂殑鍥涗釜鐐圭瓑璺濇帓鍒?姹俴鍊?
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