几道数学计算题(要用十字相乘法作,1.x2-11x+182.4m2-12m+93.5+7x-6x24.12x2+xy-6y25.x2-4x+____=(x+3)(x+_____)6.若x2+ax+b=(x+2)(x-4)则a=_____,b=________7.a3-5a2b+6ab28.2y2-4y-6
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![几道数学计算题(要用十字相乘法作,1.x2-11x+182.4m2-12m+93.5+7x-6x24.12x2+xy-6y25.x2-4x+____=(x+3)(x+_____)6.若x2+ax+b=(x+2)(x-4)则a=_____,b=________7.a3-5a2b+6ab28.2y2-4y-6](/uploads/image/z/1807509-21-9.jpg?t=%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E8%AE%A1%E7%AE%97%E9%A2%98%28%E8%A6%81%E7%94%A8%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%E4%BD%9C%2C1.x2-11x%2B182.4m2-12m%2B93.5%2B7x-6x24.12x2%2Bxy-6y25.x2-4x%2B____%3D%28x%2B3%29%28x%2B_____%296.%E8%8B%A5x2%2Bax%2Bb%3D%28x%2B2%29%28x-4%29%E5%88%99a%3D_____%2Cb%3D________7.a3-5a2b%2B6ab28.2y2-4y-6)
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