ab(c²-d²)-(a²-b²)cd
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![ab(c²-d²)-(a²-b²)cd](/uploads/image/z/1835683-43-3.jpg?t=ab%28c%26%23178%3B-d%26%23178%3B%29-%28a%26%23178%3B-b%26%23178%3B%29cd)
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ab(c²-d²)-(a²-b²)cd
ab(c²-d²)-(a²-b²)cd
ab(c²-d²)-(a²-b²)cd
原式=abc²-abd²-a²cd+b²cd
=(abc²+b²cd)-(abd²+a²cd)
=bc(ac+bd)-ad(ac+bd)
=(ac+bd)(bc-ad)
ab(c²-d²)-(a²-b²)cd
=abc²-abd²-a²cd+b²cd
=abc²+b²cd-(abd²+a²cd)
=bc(ac+bd)-ad(bd+ac)
=(bc-ad)(ac+bd)
化简吗?