用平方差公式计算: = = = = = = = = = = ——青夏教育精英家教网——

摘要：用平方差公式计算: = = = = = = = = = = = =

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用平方差公式计算：

(1)(3b＋a)(a－3b)；

(2)(3m－4n)(4n＋3m)；

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