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抛物线y＝2（x＋3）（x－2）与x轴的交点坐标分别为________．
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抛物线y＝2（x＋3）（x－2）与x轴的交点坐标分别为________．
主讲：马立忠
【思路分析】
要求抛物线与x轴的交点，即令y＝0，解方程．
【解析过程】
令y＝0，则2(x＋3)(x－2)＝0，解得x＝－3或x＝2．则抛物线y＝2(x＋3)(x－2)与x轴的交点坐标是(－3，0)，(2，0)．故答案为(－3，0)，(2，0)．
(－3，0)，(2，0)
此题考查了求抛物线与x轴的交点的坐标的方法．
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UC385-X 供应信息 IC Datasheet 数据表 (1/13 页)
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快速暂态REPONSE 5 -A低压降稳压器
[FAST TRANSIENT REPONSE 5-A LOW-DROPOUT REGULATOR]
&&UC385-XPDF文件：
快速暂态REPONSE 5 -A低压降稳压器[FAST TRANSIENT REPONSE 5-A LOW-DROPOUT REGULATOR]
文件大小：&&264 KPDF页数：
&&13 页联系供应商：&& 品牌Logo:
&&&&TI [ TEXAS INSTRUMENTS ]
UC285 1, UC285 2, UC285 3, UC285 ADJ, UC385 1, UC385 2, UC385 3, UC385 ADJFAST TRANSIENT RESPONSE 5 ALOW DROPOUT REGULATORSLUS212E - NOVEMBER 1999 - REVISED FEBRUARY 2004DDDDDDDDFast Transient Response10-mA to 5-A Load CurrentShort Circuit ProtectionMaximum Dropout of 500-mV at 5-A LoadCurrentSeparate Bias (VB) and VIN PinsAvailable in Adjustable or Fixed OutputVoltages5-Pin Package Allows Kelvin Sensing ofLoad VoltageReverse Current Protection5-PIN TO-220T PACKAGE (TOP VIEW)5-PIN TO-263TD PACKAGE(TOP VIEW)Note: Tab = GrounddescriptionThe UC385 is a low dropout linear regulator providing a quick response to fast load changes. Combined withits precision onboard reference, the UC385 excels at driving GTL and BTL buses. Due to its fast response toload transients, the total capacitance required to decouple the regulator’s output can be significantly decreasedwhen compared to standard LDO linear regulators.Dropout voltage (VIN to VOUT) is only 490 mV maximum and 350 mV typical at 5-A load (0°C to 100°C).The onboard bandgap reference is stable with temperature and scaled for a 1.2 V input to the internal poweramplifier. The UC385 is available in fixed output voltages of 1.5 V, 2.1 V, or 2.5 V. The output voltage of theadjustable version can be set with two external resistors. If the external resistors are omitted, the output voltagedefaults to 1.2 V.block diagramVB1R1UC382-ADJUC382-1 (1.5 V)UC382-2 (2.1 V)UC382-3 (2.5 V)THERMALSHUTDOWN21.2 VBANDGAPREFERENCE+VINOPEN2 kOhm2 kOhm2 kOhmR20500Ohm1.5 kOhm2.16 kOhmR1R2SHORTCIRCUITSENSE3GND5ADJ4VOUTUDG-00084Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.All trademarks are the property of their respective owners.PRODUCTION DATA information is current as of publication date.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.Copyright?, Texas Instruments IncorporatedPOST OFFICE BOX 655303oDALLAS, TEXAS 752651}