已经3x^2-xy+3y^2=20求8x^2+23y^2的最大值.x^2是x的2次方的意思.
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![已经3x^2-xy+3y^2=20求8x^2+23y^2的最大值.x^2是x的2次方的意思.](/uploads/image/z/5619230-62-0.jpg?t=%E5%B7%B2%E7%BB%8F3x%5E2-xy%2B3y%5E2%3D20%E6%B1%828x%5E2%2B23y%5E2%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC.x%5E2%E6%98%AFx%E7%9A%842%E6%AC%A1%E6%96%B9%E7%9A%84%E6%84%8F%E6%80%9D.)
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