因式分解:ab(c²-d²)-cd(a²-b²)
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因式分解:ab(c²-d²)-cd(a²-b²)
因式分解:ab(c²-d²)-cd(a²-b²)
因式分解:ab(c²-d²)-cd(a²-b²)
ab(c²-d²)-cd(a²-b²)
=abc²-abd²-a²cd+cb²d
=(abc²+cb²d)-(abd²+a²cd)
=bc(ac+bd)-ad(bd+ac)
=(ac+bd)(bc-ad)