整式的乘除法,快`(1)a²-3a+——=(a - ——)²(2)已知:a+b=9,a²+b²=21,求ab=——(3)若(x-3)(x+3)=x²+ax+b,则b的a次方=——(4)用(a+b)(a-b)=a²-b²,求(x+2y-1)(x-2y+1),变型
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![整式的乘除法,快`(1)a²-3a+——=(a - ——)²(2)已知:a+b=9,a²+b²=21,求ab=——(3)若(x-3)(x+3)=x²+ax+b,则b的a次方=——(4)用(a+b)(a-b)=a²-b²,求(x+2y-1)(x-2y+1),变型](/uploads/image/z/5508633-57-3.jpg?t=%E6%95%B4%E5%BC%8F%E7%9A%84%E4%B9%98%E9%99%A4%E6%B3%95%2C%E5%BF%AB%60%EF%BC%881%EF%BC%89a%26%23178%3B-3a%2B%E2%80%94%E2%80%94%3D%EF%BC%88a+-+%E2%80%94%E2%80%94%EF%BC%89%26%23178%3B%EF%BC%882%EF%BC%89%E5%B7%B2%E7%9F%A5%EF%BC%9Aa%2Bb%3D9%2Ca%26%23178%3B%2Bb%26%23178%3B%3D21%2C%E6%B1%82ab%3D%E2%80%94%E2%80%94%EF%BC%883%EF%BC%89%E8%8B%A5%EF%BC%88x-3%EF%BC%89%28x%2B3%29%3Dx%26%23178%3B%2Bax%2Bb%2C%E5%88%99b%E7%9A%84a%E6%AC%A1%E6%96%B9%3D%E2%80%94%E2%80%94%EF%BC%884%EF%BC%89%E7%94%A8%EF%BC%88a%2Bb%EF%BC%89%28a-b%29%3Da%26%23178%3B-b%26%23178%3B%2C%E6%B1%82%28x%2B2y-1%29%28x-2y%2B1%29%2C%E5%8F%98%E5%9E%8B)
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整式的乘除法,快`(1)a²-3a+——=(a - ——)²(2)已知:a+b=9,a²+b²=21,求ab=——(3)若(x-3)(x+3)=x²+ax+b,则b的a次方=——(4)用(a+b)(a-b)=a²-b²,求(x+2y-1)(x-2y+1),变型
整式的乘除法,快`
(1)a²-3a+——=(a - ——)²
(2)已知:a+b=9,a²+b²=21,求ab=——
(3)若(x-3)(x+3)=x²+ax+b,则b的a次方=——
(4)用(a+b)(a-b)=a²-b²,求(x+2y-1)(x-2y+1),变型为——
(5)已知m+n=2,mn=-2,则(1-m)(1-n)的值为——
整式的乘除法,快`(1)a²-3a+——=(a - ——)²(2)已知:a+b=9,a²+b²=21,求ab=——(3)若(x-3)(x+3)=x²+ax+b,则b的a次方=——(4)用(a+b)(a-b)=a²-b²,求(x+2y-1)(x-2y+1),变型
(1) 9/4 3/2
(2) 30
(3) 1
(4) x^2-(2y-1)^2
(5) -3