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{{HTML}}函数f(x，y，z)=一2x2在x2一y2一2z2=2条件下的极大值是___________．

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Thank you for your purchase of a Philips desk light! Operation InstructionsThis desk light is not waterproof and is only suitable for indoor usage.No alternations of any kind should be carried out on this desk light.Do not use any voltage exceeding a 10% margin of the specified standard.Do not touch the lamp inside or the lamp shade when the power is switched on.Do not place flammable material near the desk light.In case of operation failure, please switch off the desk light, unplug the power cord and contact your nearest Philips dealer.This desk light is suitable for Philips PL-F/4P 27W compact fluorescent lamps only. InstallationTake out the desk light body, base and clip.To use the desk light with the base, insert the stem onto the base plate and tighten the fixing screw.To use the desk light with the clip, mount the clip onto the desired surface and tighten the fixing screw, then insert the stem onto the clip.The supplied clip is not suitable for use on tubes. MaintenanceIn order to ensure optimum performance, we recommend you to clean the desk light twice a year. When cleaning the desk light take care to use soft cotton clothes only.Do not use chemical solvents to clean the desk light, it might damage the painted surfaces. CautionPlease turn off the power and unplug the desk light before replacing the lamp! [Key Words] compact fluorescent lamps n. 电子节能灯