已知X,Y都是正数,且满足X+2Y+XY=30,求XY的最大值,并求出此时X,Y的值.用均植不等式,如何体现”定”的思想我不是问如何做,是问如何体现"定"的思想,就是和一定,积有最大值;积一定,和有最小值
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![已知X,Y都是正数,且满足X+2Y+XY=30,求XY的最大值,并求出此时X,Y的值.用均植不等式,如何体现”定”的思想我不是问如何做,是问如何体现](/uploads/image/z/1641052-28-2.jpg?t=%E5%B7%B2%E7%9F%A5X%2CY%E9%83%BD%E6%98%AF%E6%AD%A3%E6%95%B0%2C%E4%B8%94%E6%BB%A1%E8%B6%B3X%2B2Y%2BXY%3D30%2C%E6%B1%82XY%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%2C%E5%B9%B6%E6%B1%82%E5%87%BA%E6%AD%A4%E6%97%B6X%2CY%E7%9A%84%E5%80%BC.%E7%94%A8%E5%9D%87%E6%A4%8D%E4%B8%8D%E7%AD%89%E5%BC%8F%2C%E5%A6%82%E4%BD%95%E4%BD%93%E7%8E%B0%E2%80%9D%E5%AE%9A%E2%80%9D%E7%9A%84%E6%80%9D%E6%83%B3%E6%88%91%E4%B8%8D%E6%98%AF%E9%97%AE%E5%A6%82%E4%BD%95%E5%81%9A%2C%E6%98%AF%E9%97%AE%E5%A6%82%E4%BD%95%E4%BD%93%E7%8E%B0%22%E5%AE%9A%22%E7%9A%84%E6%80%9D%E6%83%B3%2C%E5%B0%B1%E6%98%AF%E5%92%8C%E4%B8%80%E5%AE%9A%2C%E7%A7%AF%E6%9C%89%E6%9C%80%E5%A4%A7%E5%80%BC%3B%E7%A7%AF%E4%B8%80%E5%AE%9A%2C%E5%92%8C%E6%9C%89%E6%9C%80%E5%B0%8F%E5%80%BC)
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