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11。等差数列等比数列
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你可能喜欢在等比数列{an}中，a3?a6?a9=1000，则a1a11的值是（　　）A．10000B．1000C．100D．1_百度知道
在等比数列{an}中，a3?a6?a9=1000，则a1a11的值是（　　）A．10000B．1000C．100D．1
a6在等比数列{an}中?a9=1000，a3
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90%">1aa<span style="vertical-align?a9=1000∵数列{an}是等比数列:90%" dealflag="1">2＝100．故选，则a6=10;font-size:font-font-size:font-size，且a3;wordSpacing，∴611＝a<span style="vertical-align:font-size:normal:super?a6:nowrap:wordWrap:90%">63＝1000;wordWrap:sub，∴
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出门在外也不愁设数列{an}和{bn}都是等差数列，且a1=25，b1=75，a2+b2=100，那么由an+bn所组成的数列的第37项的值为（　　）A. 0B. 37C. 100D. -37
∵a1=25，b1=75∴a1+b1=100∵数列{an}和{bn}都是等差数列∴{an+bn}组成的数列也是等差数列而a2+b2=100，那么an+bn=100∴a37+b37=100故选C．
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先求出a1+b1的值，然后根据{an+bn}组成的数列也是等差数列，而a2+b2=100，可求出通项an+bn，从而求出所求．
本题考点：
等差数列的通项公式；等差数列的性质．
考点点评：
本题主要考查了等差数列的通项公式，解题的关键{an+bn}组成的数列也是等差数列，属于基础题．
100 啊 ！！
且a1=25,b1=75,a2加b2=100
可以得知 an和bn的公差是互为相反数
也就是 an公差为d
则bn公差为-d
所以a37+b37= a1+36d+b1+36（-d)=a1+b1=25+75=100
设公差分别为m和na2+b2=100a1+m+b1+n=100m+n=0S37=a37+b37=(a1+36m)+(b1+36n)=a1+b1+36(m+n)=a1+b1=100
a1=25,b1=75,a2加b2=100,a2+b2=a1+d1+a2+d2=100,d1+d2=0,a3+b3=a1+2d1+b1+2d2=100,……，a37+b37=a1+36d1+b1+36d2=100(a1+b1)+(a2+b2)+(a3+b3)+……+(a37+b37)=100*37=3700
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> DRA1-CMX100D10 (Crydom Co.)RELAY SSR SPST-NO 100VDC 8A DIN
DRA SeriesAC/DC Output SSR AssembliesReady-to-use SSR assemblies for either AC or DC output10 mm Single channel and 54 mm Four channel DIN Rail mount assemblies available3 to 15 or 15 to 32 VDC input versions include LED indicator3 to 32 VDC, 18 to 36 and 90 to 140 AC input control versions do not include LED indicatorAC output ratings up to 300 VAC @ 8 Amps (UL) and 380 VAC 8 amps (IEC)DC output ratings up to 200 VDC and 8 AmpsCage style screw terminals for easy and reliable wire connectionSocket clip fits all standard 35 mm DIN rail profilesStandard Assemblies (A)OutputOutputControlInputInputOperating1channelDC outputVoltageRangeVDCCurrentRange (B)ADCVoltageRangeVDCCurrent@ 5/24 VdcmAStatusIndicatorSSRFunctionIsolationVoltageVrmsTemp.Range°CDRA1-CMX100D10DRA1-CMX100D6DRA1-CMX200D3DRA1-CMX60D10DRA1-CMX60D5DRA1-CMXE100D10DRA1-CMXE100D6DRA1-CMXE200D3DRA1-CMXE60D10DRA1-CMXE60D5DRA1-MPDCD3DRA1-MPDCD3-B1-1001-1001-2001-601-601-1001-1001-2001-601-603-603-600-80-60-30-80-50-80-60-30-80-5.02-3.02-33-103-103-103-103-1020-2820-2820-2820-2820-283-323-321515151515151515151533YesYesYesYesYesYesYesYesYesYesNoNoSPST-NOSPST-NOSPST-NOSPST-NOSPST-NOSPST-NOSPST-NOSPST-NOSPST-NOSPST-NOSPST-NOSPST-NC250025002500250025002500250025002500250040004000-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-40 to 80-40 to 80OutputOutputControlInputInputOperating1channelAC outputVoltageRangeVACCurrentRange (B)ArmsVoltageRangeVDCCurrent@ 5/24 VdcmAStatusIndicatorSSRFunctionIsolationVoltageVrmsTemp.Range°CDRA1-CX240D5DRA1-CX240D5-BDRA1-CX240D5RDRA1-CX380D5DRA1-CX380D5RDRA1-CXE240D5DRA1-CXE240D5RDRA1-CXE380D5DRA1-MCX240D5DRA1-MCX380D5DRA1-MCXE240D5DRA1-MCXE380D5DRA1-MP120D3DRA1-MP240D3DRA1-MP240D4DRA1-SPF240A25DRA1-SPF240D25DRA1-SPF240D25RDRA1-SPF380D25DRA1-SPF380D25RDRA1-SPFE240A25DRA1-SPFE240D25DRA1-SPFE240D25R12-28012-28012-28048-53048-53012-28012-28048-53012-28048-53012-28048-53012-14024-28024-28012-28012-28012-28048-53048-53012-28012-28012-280.06-5.06-5.06-5.06-5.06-5.06-5.06-5.06-5.06-5.06-5.06-5.06-5.02-3.02-3.02-4.06-8.06-8.06-8.06-8.06-8.06-8.06-8.06-83-154-283-154-154-1515-3215-3215-323-154-1515-3215-323-323-323-3290-140 VAC3-153-154-154-1518-36 VAC15-3215-321515151515151515151515153331015151515101515YesNoYesYesYesYesYesYesYesYesYesYesNoNoNoNoYesYesYesYesNoYesYesSPST-NO, Zero Voltage Turn-OnSPST-NC, Zero Voltage Turn-OnSPST-NO, Random Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Random Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Random Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Random Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Random Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Random Turn-On40004000400040004000400040004000400040004000400040004000400040004000400040004000400040004000-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-40 to 80-40 to 80-40 to 80-40 to 80-40 to 80-40 to 80-40 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80-30 to 80OutputOutputControlInputInputOperating4channelDC outputVoltageRangeVDCCurrentRange (B)ADCVoltageRangeVDCCurrent@ 5/24 VdcmAStatusIndicatorSSRFunctionIsolationVoltageVrmsTemp.Range°CDRA4-CMX100D10DRA4-CMX200D3DRA4-CMXE100D10DRA4-CMXE200D31-1001-2001-1001-2000-80-30-80-33-103-1020-2820-2815151515YesYesYesYesSPST-NOSPST-NOSPST-NOSPST-NO2500250025002500-30 to 80-30 to 80-30 to 80-30 to 80OutputOutputControlInputInputOperating4channelAC outputVoltageRangeVACCurrentRange (B)ArmsVoltageRangeVDCCurrent@ 5/24 VdcmAStatusIndicatorSSRFunctionIsolationVoltageVrmsTemp.Range°CDRA4-CX240D5DRA4-CXE240D5DRA4-MCX240D5DRA4-MCXE240D512-28012-28012-28012-280.06-5.06-5.06-5.06-53-1515-323-1515-3215151515YesYesYesYesSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-OnSPST-NO, Zero Voltage Turn-On4000400040004000-30 to 80-30 to 80-40 to 80-40 to 80(A) For full SSR specifications see product datasheet at (B) Maximum output current rating of any assembly is 8 amps per channel @ 40°C ambient, derating from full output to 0 amps @ 80°C ambient.Other Crydom products and competitive part number cross-reference available at:
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