1.a²-8a+16 2.49x²+28+43.利用因式分解计算:(1)2009²-81(2)202²+202×196+98²4.2ab-a²-b²5.9m²+3mn+1/4n²6.a²-ab+ac-bc 7.m²+5n-mn-5m8.声音在15℃空气中的传播速度是340m/s,
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![1.a²-8a+16 2.49x²+28+43.利用因式分解计算:(1)2009²-81(2)202²+202×196+98²4.2ab-a²-b²5.9m²+3mn+1/4n²6.a²-ab+ac-bc 7.m²+5n-mn-5m8.声音在15℃空气中的传播速度是340m/s,](/uploads/image/z/2838688-16-8.jpg?t=1.a%26sup2%3B-8a%2B16+2.49x%26sup2%3B%2B28%2B43.%E5%88%A9%E7%94%A8%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%892009%26sup2%3B-81%EF%BC%882%EF%BC%89202%26sup2%3B%2B202%C3%97196%2B98%26sup2%3B4.2ab-a%26sup2%3B-b%26sup2%3B5.9m%26sup2%3B%2B3mn%2B1%2F4n%26sup2%3B6.a%26sup2%3B-ab%2Bac-bc+7.m%26sup2%3B%2B5n-mn-5m8.%E5%A3%B0%E9%9F%B3%E5%9C%A815%E2%84%83%E7%A9%BA%E6%B0%94%E4%B8%AD%E7%9A%84%E4%BC%A0%E6%92%AD%E9%80%9F%E5%BA%A6%E6%98%AF340m%2Fs%EF%BC%8C)
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