因式分解:1.x^2+2x-12.x^2+6x+63.4x^2+12x+74.设a^2,b^2,c^2,d^2为整数,且满足(ab+cd)^2+(ad-bc)^2=36,求a^2+b^2+c^2+d^25.已知:x、y为实数,求:5x^2-4xy+4y^2+12x+25的最小值
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![因式分解:1.x^2+2x-12.x^2+6x+63.4x^2+12x+74.设a^2,b^2,c^2,d^2为整数,且满足(ab+cd)^2+(ad-bc)^2=36,求a^2+b^2+c^2+d^25.已知:x、y为实数,求:5x^2-4xy+4y^2+12x+25的最小值](/uploads/image/z/31265-17-5.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A1.x%5E2%2B2x-12.x%5E2%2B6x%2B63.4x%5E2%2B12x%2B74.%E8%AE%BEa%5E2%2Cb%5E2%2Cc%5E2%2Cd%5E2%E4%B8%BA%E6%95%B4%E6%95%B0%2C%E4%B8%94%E6%BB%A1%E8%B6%B3%28ab%2Bcd%29%5E2%2B%28ad-bc%29%5E2%3D36%2C%E6%B1%82a%5E2%2Bb%5E2%2Bc%5E2%2Bd%5E25.%E5%B7%B2%E7%9F%A5%3Ax%E3%80%81y%E4%B8%BA%E5%AE%9E%E6%95%B0%2C%E6%B1%82%3A5x%5E2-4xy%2B4y%5E2%2B12x%2B25%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC)
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