这题用十字相乘法怎么做?3Q^2 - 12Q - 36 = 0 题中Q就是未知数啦,^2表示平方.P.s.我就是有点疑惑,怎么把常数分解成合适的两个数?楼下都把“-12”分解成“-6 +2”,不能是“+6 -2”or“+3 -4”or“-4 +
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![这题用十字相乘法怎么做?3Q^2 - 12Q - 36 = 0 题中Q就是未知数啦,^2表示平方.P.s.我就是有点疑惑,怎么把常数分解成合适的两个数?楼下都把“-12”分解成“-6 +2”,不能是“+6 -2”or“+3 -4”or“-4 +](/uploads/image/z/8351469-45-9.jpg?t=%E8%BF%99%E9%A2%98%E7%94%A8%E5%8D%81%E5%AD%97%E7%9B%B8%E4%B9%98%E6%B3%95%E6%80%8E%E4%B9%88%E5%81%9A%3F3Q%5E2+-+12Q+-+36+%3D+0+%E9%A2%98%E4%B8%ADQ%E5%B0%B1%E6%98%AF%E6%9C%AA%E7%9F%A5%E6%95%B0%E5%95%A6%2C%5E2%E8%A1%A8%E7%A4%BA%E5%B9%B3%E6%96%B9.P.s.%E6%88%91%E5%B0%B1%E6%98%AF%E6%9C%89%E7%82%B9%E7%96%91%E6%83%91%2C%E6%80%8E%E4%B9%88%E6%8A%8A%E5%B8%B8%E6%95%B0%E5%88%86%E8%A7%A3%E6%88%90%E5%90%88%E9%80%82%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%95%B0%3F%E6%A5%BC%E4%B8%8B%E9%83%BD%E6%8A%8A%E2%80%9C-12%E2%80%9D%E5%88%86%E8%A7%A3%E6%88%90%E2%80%9C-6+%2B2%E2%80%9D%EF%BC%8C%E4%B8%8D%E8%83%BD%E6%98%AF%E2%80%9C%2B6+-2%E2%80%9Dor%E2%80%9C%2B3+-4%E2%80%9Dor%E2%80%9C-4+%2B)
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