解二元一次方程:降次 (1)x^2-4x+1=0.(2)3x^2-3x-6=0.(3)2x^2-4x-2.5=0.(4)(x-1)^2-2(x-1)-3=0 ..1)x^2-4x+1=0.(2)3x^2-3x-6=0.(3)2x^2-4x-2.5=0.(4)(x-1)^2-2(x-1)-3=0 (5)若某商品成本价为360元,两次降价后为100元,若每次降
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![解二元一次方程:降次 (1)x^2-4x+1=0.(2)3x^2-3x-6=0.(3)2x^2-4x-2.5=0.(4)(x-1)^2-2(x-1)-3=0 ..1)x^2-4x+1=0.(2)3x^2-3x-6=0.(3)2x^2-4x-2.5=0.(4)(x-1)^2-2(x-1)-3=0 (5)若某商品成本价为360元,两次降价后为100元,若每次降](/uploads/image/z/11502149-5-9.jpg?t=%E8%A7%A3%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%EF%BC%9A%E9%99%8D%E6%AC%A1+%EF%BC%881%EF%BC%89x%5E2-4x%2B1%3D0.%282%293x%5E2-3x-6%3D0.%283%292x%5E2-4x-2.5%3D0.%284%29%28x-1%29%5E2-2%28x-1%29-3%3D0+..1%EF%BC%89x%5E2-4x%2B1%3D0.%282%293x%5E2-3x-6%3D0.%283%292x%5E2-4x-2.5%3D0.%284%29%28x-1%29%5E2-2%28x-1%29-3%3D0+%EF%BC%885%EF%BC%89%E8%8B%A5%E6%9F%90%E5%95%86%E5%93%81%E6%88%90%E6%9C%AC%E4%BB%B7%E4%B8%BA360%E5%85%83%2C%E4%B8%A4%E6%AC%A1%E9%99%8D%E4%BB%B7%E5%90%8E%E4%B8%BA100%E5%85%83%2C%E8%8B%A5%E6%AF%8F%E6%AC%A1%E9%99%8D)
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