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A、B两相距7千米甲B发15钟乙A发追赶甲乙速度甲3/2倍结乙发2追甲求甲、乙速度
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设甲速度X乙速度1.5X1.5X*2=X*(2+15/60)+73X=2.25X+7X=28/3甲速度=28/3乙速度=42/3
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配件行车记录仪车载电源线 适用P0/P1W/P2/P2X/P1PRO/120/320/330/600/650/660长4.1米（ 原装）
配件行车记录仪车载电源线 适用P0/P1W/P2/P2X/P1PRO/120/320/330/600/650/660长4.1米（ 原装）参考价格：￥68本周成交：1笔关注热度：12人电线够长使用方便还可以一般记录清晰图像清晰拍摄清晰画质清晰适用车型：通用 | 产品品牌：PAPAGO
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配件行车记录仪车载电源线 适用P0/P1W/P2/P2X/P1PRO/120/320/330/600/650/660长4.1米（ 原装）&鸿坤&林语墅二期预计9月份开盘 均价50000元/平(&&&&)为精装别墅项目，均价50000元/平，精装标准10000元/平，总价为1500万/套起，最高价2500万左右/套。产品为260-280平米叠拼与360-370平米联排，共276套房源。项目于日开盘一期，共34套房源，剩余少量在售，二期预计9月份开盘，套数待定。小区为纯别墅社区，容积率1.02。项目位于地铁四号线西红门站东800米，样板区已开放，预计2015年上半年入住。敬请关注！鸿坤&林语墅(&&&&)效果图地铁4号线西红门站下车向东800米即到。鸿坤&林语墅(&&&&)交通图搜房网提供的售楼电话：400-890-0000 转 25477
鸿坤林语墅-->&鸿坤&林语墅二期预计9月份开盘 均价50000元/平(&&&&)为精装别墅项目，均价50000元/平，精装标准10000元/平，总价为1500万/套起，最高价2500万左右/套。产品为260-280平米叠拼与360-370平米联排，共276套房源。项目于日开盘一期，共34套房源，剩余少量在售，二期预计9月份开盘，套数待定。小区为纯别墅社区，容积率1.02。项目位于地铁四号线西红门站东800米，样板区已开放，预计2015年上半年入住。敬请关注！鸿坤&林语墅(&&&&)效果图地铁4号线西红门站下车向东800米即到。鸿坤&林语墅(&&&&)交通图搜房网提供的售楼电话：400-890-0000 转 25477
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[不良信息举报:010-][][]。EP元件库|天正电气 2013年最新价格
ST3PA-A 0.5s/5s/30s/3m AC36V ST3PA-A 0.5s/5s/30s/3m AC110V ST3PA-A 0.5s/5s/30s/3m AC127V ST3PA-A 0.5s/5s/30s/3m AC220V ST3PA-A 0.5s/5s/30s/3m AC380V ST3PA-A 0.5s/5s/30s/3m DC12V ST3PA-A 0.5s/5s/30s/3m DC24V ST3PA-B 1s/10s/60s/6m AC36V ST3PA-B 1s/10s/60s/6m AC110V ST3PA-B 1s/10s/60s/6m AC127V ST3PA-B 1s/10s/60s/6m AC220V ST3PA-B 1s/10s/60s/6m AC380V ST3PA-B 1s/10s/60s/6m DC12V ST3PA-B 1s/10s/60s/6m DC24V ST3PA-C 5s/50s/5m/30m AC36V ST3PA-C 5s/50s/5m/30m AC110V ST3PA-C 5s/50s/5m/30m AC127V ST3PA-C 5s/50s/5m/30m AC220V ST3PA-C 5s/50s/5m/30m AC380V ST3PA-C 5s/50s/5m/30m DC12V ST3PA-C 5s/50s/5m/30m DC24V ST3PA-D 10s/100s/10m/60m AC36V ST3PA-D 10s/100s/10m/60m AC110V ST3PA-D 10s/100s/10m/60m AC127V ST3PA-D 10s/100s/10m/60m AC220V ST3PA-D 10s/100s/10m/60m AC380V ST3PA-D 10s/100s/10m/60m DC12V ST3PA-D 10s/100s/10m/60m DC24V ST3PA-E 60s/10m/60m/6h AC36V ST3PA-E 60s/10m/60m/6h AC110V ST3PA-E 60s/10m/60m/6h AC127V ST3PA-E 60s/10m/60m/6h AC220V ST3PA-E 60s/10m/60m/6h AC380V ST3PA-E 60s/10m/60m/6h DC12V ST3PA-E 60s/10m/60m/6h DC24V ST3PA-F 2m/20m/2h/12h AC36V ST3PA-F 2m/20m/2h/12h AC110V ST3PA-F 2m/20m/2h/12h AC127V ST3PA-F 2m/20m/2h/12h AC220V ST3PA-F 2m/20m/2h/12h AC380V ST3PA-F 2m/20m/2h/12h DC12V ST3PA-F 2m/20m/2h/12h DC24V ST3PA-G 4m/40m/4h/24h AC36V ST3PA-G 4m/40m/4h/24h AC110V ST3PA-G 4m/40m/4h/24h AC127V ST3PA-G 4m/40m/4h/24h AC220V ST3PA-G 4m/40m/4h/24h AC380V ST3PA-G 4m/40m/4h/24h DC12V ST3PA-G 4m/40m/4h/24h DC24V ST3PC-A 0.5s/5s/30s/3m AC36V ST3PC-A 0.5s/5s/30s/3m AC110V ST3PC-A 0.5s/5s/30s/3m AC127V ST3PC-A 0.5s/5s/30s/3m AC220V ST3PC-A 0.5s/5s/30s/3m AC380V ST3PC-A 0.5s/5s/30s/3m DC12V ST3PC-A 0.5s/5s/30s/3m DC24V ST3PC-B 1s/10s/60s/6m AC36V ST3PC-B 1s/10s/60s/6m AC110V ST3PC-B 1s/10s/60s/6m AC127V ST3PC-B 1s/10s/60s/6m AC220V ST3PC-B 1s/10s/60s/6m AC380V ST3PC-B 1s/10s/60s/6m DC12V ST3PC-B 1s/10s/60s/6m DC24V ST3PC-C 5s/50s/5m/30m AC36V ST3PC-C 5s/50s/5m/30m AC110V ST3PC-C 5s/50s/5m/30m AC127V ST3PC-C 5s/50s/5m/30m AC220V ST3PC-C 5s/50s/5m/30m AC380V ST3PC-C 5s/50s/5m/30m DC12V ST3PC-C 5s/50s/5m/30m DC24V ST3PC-D 10s/100s/10m/60m AC36V ST3PC-D 10s/100s/10m/60m AC110V ST3PC-D 10s/100s/10m/60m AC127V ST3PC-D 10s/100s/10m/60m AC220V ST3PC-D 10s/100s/10m/60m AC380V ST3PC-D 10s/100s/10m/60m DC12V ST3PC-D 10s/100s/10m/60m DC24V ST3PC-E 60s/10m/60m/6h AC36V ST3PC-E 60s/10m/60m/6h AC110V ST3PC-E 60s/10m/60m/6h AC127V ST3PC-E 60s/10m/60m/6h AC220V ST3PC-E 60s/10m/60m/6h AC380V ST3PC-E 60s/10m/60m/6h DC12V ST3PC-E 60s/10m/60m/6h DC24V ST3PC-F 2m/20m/2h/12h AC36V ST3PC-F 2m/20m/2h/12h AC110V ST3PC-F 2m/20m/2h/12h AC127V ST3PC-F 2m/20m/2h/12h AC220V ST3PC-F 2m/20m/2h/12h AC380V ST3PC-F 2m/20m/2h/12h DC12V ST3PC-F 2m/20m/2h/12h DC24V ST3PC-G 4m/40m/4h/24h AC36V ST3PC-G 4m/40m/4h/24h AC110V ST3PC-G 4m/40m/4h/24h AC127V ST3PC-G 4m/40m/4h/24h AC220V ST3PC-G 4m/40m/4h/24h AC380V ST3PC-G 4m/40m/4h/24h DC12V ST3PC-G 4m/40m/4h/24h DC24V ST3PF-1s/2s/5s/10s/30s/60s/120s AC36V ST3PF-1s/2s/5s/10s/30s/60s/120s AC110V ST3PF-1s/2s/5s/10s/30s/60s/120s AC127V ST3PF-1s/2s/5s/10s/30s/60s/120s AC220V ST3PF-1s/2s/5s/10s/30s/60s/120s AC380V ST3PF-1s/2s/5s/10s/30s/60s/120s DC12V ST3PF-1s/2s/5s/10s/30s/60s/120s DC24V ST3PY-5s/10s/30s/60s AC36V ST3PY-5s/10s/30s/60s AC110V ST3PY-5s/10s/30s/60s AC127V ST3PY-5s/10s/30s/60s AC220V ST3PY-5s/10s/30s/60s AC380V ST3PY-5s/10s/30s/60s DC12V ST3PY-5s/10s/30s/60s DC24V ST3PR-0.5-6s/60s AC36V ST3PR-0.5-6s/60s AC110V ST3PR-0.5-6s/60s AC127V ST3PR-0.5-6s/60s AC220V ST3PR-0.5-6s/60s AC380V ST3PR-0.5-6s/60s DC12V ST3PR-0.5-6s/60s DC24V ST3PR-1-10s/10m AC36V ST3PR-1-10s/10m AC110V ST3PR-1-10s/10m AC127V ST3PR-1-10s/10m AC220V ST3PR-1-10s/10m AC380V ST3PR-1-10s/10m DC12V ST3PR-1-10s/10m DC24V ST3PR-2.5-30s/30m AC36V ST3PR-2.5-30s/30m AC110V ST3PR-2.5-30s/30m AC127V ST3PR-2.5-30s/30m AC220V ST3PR-2.5-30s/30m AC380V ST3PR-2.5-30s/30m DC12V ST3PR-2.5-30s/30m DC24V -1 2013最新价格
产品规格列表
1.ST3PA-A 0.5s/5s/30s/3m AC36V2.ST3PA-A 0.5s/5s/30s/3m AC110V3.ST3PA-A 0.5s/5s/30s/3m AC127V4.ST3PA-A 0.5s/5s/30s/3m AC220V5.ST3PA-A 0.5s/5s/30s/3m AC380V6.ST3PA-A 0.5s/5s/30s/3m DC12V7.ST3PA-A 0.5s/5s/30s/3m DC24V8.ST3PA-B 1s/10s/60s/6m AC36V9.ST3PA-B 1s/10s/60s/6m AC110V10.ST3PA-B 1s/10s/60s/6m AC127V11.ST3PA-B 1s/10s/60s/6m AC220V12.ST3PA-B 1s/10s/60s/6m AC380V13.ST3PA-B 1s/10s/60s/6m DC12V14.ST3PA-B 1s/10s/60s/6m DC24V15.ST3PA-C 5s/50s/5m/30m AC36V16.ST3PA-C 5s/50s/5m/30m AC110V17.ST3PA-C 5s/50s/5m/30m AC127V18.ST3PA-C 5s/50s/5m/30m AC220V19.ST3PA-C 5s/50s/5m/30m AC380V20.ST3PA-C 5s/50s/5m/30m DC12V21.ST3PA-C 5s/50s/5m/30m DC24V22.ST3PA-D 10s/100s/10m/60m AC36V23.ST3PA-D 10s/100s/10m/60m AC110V24.ST3PA-D 10s/100s/10m/60m AC127V25.ST3PA-D 10s/100s/10m/60m AC220V26.ST3PA-D 10s/100s/10m/60m AC380V27.ST3PA-D 10s/100s/10m/60m DC12V28.ST3PA-D 10s/100s/10m/60m DC24V29.ST3PA-E 60s/10m/60m/6h AC36V30.ST3PA-E 60s/10m/60m/6h AC110V31.ST3PA-E 60s/10m/60m/6h AC127V32.ST3PA-E 60s/10m/60m/6h AC220V33.ST3PA-E 60s/10m/60m/6h AC380V34.ST3PA-E 60s/10m/60m/6h DC12V35.ST3PA-E 60s/10m/60m/6h DC24V36.ST3PA-F 2m/20m/2h/12h AC36V37.ST3PA-F 2m/20m/2h/12h AC110V38.ST3PA-F 2m/20m/2h/12h AC127V39.ST3PA-F 2m/20m/2h/12h AC220V40.ST3PA-F 2m/20m/2h/12h AC380V41.ST3PA-F 2m/20m/2h/12h DC12V42.ST3PA-F 2m/20m/2h/12h DC24V43.ST3PA-G 4m/40m/4h/24h AC36V44.ST3PA-G 4m/40m/4h/24h AC110V45.ST3PA-G 4m/40m/4h/24h AC127V46.ST3PA-G 4m/40m/4h/24h AC220V47.ST3PA-G 4m/40m/4h/24h AC380V48.ST3PA-G 4m/40m/4h/24h DC12V49.ST3PA-G 4m/40m/4h/24h DC24V50.ST3PC-A 0.5s/5s/30s/3m AC36V51.ST3PC-A 0.5s/5s/30s/3m AC110V52.ST3PC-A 0.5s/5s/30s/3m AC127V53.ST3PC-A 0.5s/5s/30s/3m AC220V54.ST3PC-A 0.5s/5s/30s/3m AC380V55.ST3PC-A 0.5s/5s/30s/3m DC12V56.ST3PC-A 0.5s/5s/30s/3m DC24V57.ST3PC-B 1s/10s/60s/6m AC36V58.ST3PC-B 1s/10s/60s/6m AC110V59.ST3PC-B 1s/10s/60s/6m AC127V60.ST3PC-B 1s/10s/60s/6m AC220V61.ST3PC-B 1s/10s/60s/6m AC380V62.ST3PC-B 1s/10s/60s/6m DC12V63.ST3PC-B 1s/10s/60s/6m DC24V64.ST3PC-C 5s/50s/5m/30m AC36V65.ST3PC-C 5s/50s/5m/30m AC110V66.ST3PC-C 5s/50s/5m/30m AC127V67.ST3PC-C 5s/50s/5m/30m AC220V68.ST3PC-C 5s/50s/5m/30m AC380V69.ST3PC-C 5s/50s/5m/30m DC12V70.ST3PC-C 5s/50s/5m/30m DC24V71.ST3PC-D 10s/100s/10m/60m AC36V72.ST3PC-D 10s/100s/10m/60m AC110V73.ST3PC-D 10s/100s/10m/60m AC127V74.ST3PC-D 10s/100s/10m/60m AC220V75.ST3PC-D 10s/100s/10m/60m AC380V76.ST3PC-D 10s/100s/10m/60m DC12V77.ST3PC-D 10s/100s/10m/60m DC24V78.ST3PC-E 60s/10m/60m/6h AC36V79.ST3PC-E 60s/10m/60m/6h AC110V80.ST3PC-E 60s/10m/60m/6h AC127V81.ST3PC-E 60s/10m/60m/6h AC220V82.ST3PC-E 60s/10m/60m/6h AC380V83.ST3PC-E 60s/10m/60m/6h DC12V84.ST3PC-E 60s/10m/60m/6h DC24V85.ST3PC-F 2m/20m/2h/12h AC36V86.ST3PC-F 2m/20m/2h/12h AC110V87.ST3PC-F 2m/20m/2h/12h AC127V88.ST3PC-F 2m/20m/2h/12h AC220V89.ST3PC-F 2m/20m/2h/12h AC380V90.ST3PC-F 2m/20m/2h/12h DC12V91.ST3PC-F 2m/20m/2h/12h DC24V92.ST3PC-G 4m/40m/4h/24h AC36V93.ST3PC-G 4m/40m/4h/24h AC110V94.ST3PC-G 4m/40m/4h/24h AC127V95.ST3PC-G 4m/40m/4h/24h AC220V96.ST3PC-G 4m/40m/4h/24h AC380V97.ST3PC-G 4m/40m/4h/24h DC12V98.ST3PC-G 4m/40m/4h/24h DC24V99.ST3PF-1s/2s/5s/10s/30s/60s/120s AC36V100.ST3PF-1s/2s/5s/10s/30s/60s/120s AC110V101.ST3PF-1s/2s/5s/10s/30s/60s/120s AC127V102.ST3PF-1s/2s/5s/10s/30s/60s/120s AC220V103.ST3PF-1s/2s/5s/10s/30s/60s/120s AC380V104.ST3PF-1s/2s/5s/10s/30s/60s/120s DC12V105.ST3PF-1s/2s/5s/10s/30s/60s/120s DC24V106.ST3PY-5s/10s/30s/60s AC36V107.ST3PY-5s/10s/30s/60s AC110V108.ST3PY-5s/10s/30s/60s AC127V109.ST3PY-5s/10s/30s/60s AC220V110.ST3PY-5s/10s/30s/60s AC380V111.ST3PY-5s/10s/30s/60s DC12V112.ST3PY-5s/10s/30s/60s DC24V113.ST3PR-0.5-6s/60s AC36V114.ST3PR-0.5-6s/60s AC110V115.ST3PR-0.5-6s/60s AC127V116.ST3PR-0.5-6s/60s AC220V117.ST3PR-0.5-6s/60s AC380V118.ST3PR-0.5-6s/60s DC12V119.ST3PR-0.5-6s/60s DC24V120.ST3PR-1-10s/10m AC36V121.ST3PR-1-10s/10m AC110V122.ST3PR-1-10s/10m AC127V123.ST3PR-1-10s/10m AC220V124.ST3PR-1-10s/10m AC380V125.ST3PR-1-10s/10m DC12V126.ST3PR-1-10s/10m DC24V127.ST3PR-2.5-30s/30m AC36V128.ST3PR-2.5-30s/30m AC110V129.ST3PR-2.5-30s/30m AC127V130.ST3PR-2.5-30s/30m AC220V131.ST3PR-2.5-30s/30m AC380V132.ST3PR-2.5-30s/30m DC12V133.ST3PR-2.5-30s/30m DC24V阅读下面计算1/1×3+1/3×5+1/5×7+…+1/9×11的过程，然后填空．解：因为1/1×3=1/2（1/1-1/3），1/3×5=1/2（1/3-1/5）…1/9×11=1/2（1/9-1/11）所以1/1×3+1/3×5+1/5×7+…+1/9×11=1/2（1/1-1/3）+1/2（1/3-1/5）+1/2（1/3-1/7）…+1/2（1/9-1/11）=1/2（1/1-1/3+1/3-1/5+1/5-1/7…+1/9-1/11）=1/2（1/1-1/11）=5/11以上方法为裂项求和法，请类比完成：（1）1/2×4+1/4×6+1/6×8+…+1/18×20=___．（2）在和式1/1×3+1/3×5+1/5×7+…+___=6/13中最未一项为___．-乐乐题库
& 规律型知识点 & “阅读下面计算1/1×3+1/3×5+1/...”习题详情
240位同学学习过此题，做题成功率70.8%
阅读下面计算11×3+13×5+15×7+…+19×11的过程，然后填空．解：因为11×3=12（11-13），13×5=12（13-15）…19×11=12（19-111）所以11×3+13×5+15×7+…+19×11=12（11-13）+12（13-15）+12（13-17）…+12（19-111）=12（11-13+13-15+15-17…+19-111）=12（11-111）=511以上方法为裂项求和法，请类比完成：（1）12×4+14×6+16×8+…+118×20=940．（2）在和式11×3+13×5+15×7+…+111×13=613中最未一项为111×13．
本题难度：一般
题型：填空题&|&来源：网络
分析与解答
习题“阅读下面计算1/1×3+1/3×5+1/5×7+…+1/9×11的过程，然后填空．解：因为1/1×3=1/2（1/1-1/3），1/3×5=1/2（1/3-1/5）…1/9×11=1/2（1/9-1/11）所以...”的分析与解答如下所示：
（1）只需按照给出的规律展开即可求得，（2）根据结果求左边最后一项，可以运用方程思想求出最后一项所在位置．
解：（1）原式=12（ 12-14+14-16+…+118-120），=12×（ 12-120），=940．（2）设最后一项为 1x(x+2)，则原式=12（1-13+13-15+…+1x-1x+2）=613，解得x=11．故最后一项为 111×13．故答案为：（1）940；（2）111×13．
此题主要考查了数字的变化类．此类问题一般都可以展开，前后项消去，最后只剩下前后两端的数值，计算较为简便．
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阅读下面计算1/1×3+1/3×5+1/5×7+…+1/9×11的过程，然后填空．解：因为1/1×3=1/2（1/1-1/3），1/3×5=1/2（1/3-1/5）…1/9×11=1/2（1/9-1/...
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经过分析，习题“阅读下面计算1/1×3+1/3×5+1/5×7+…+1/9×11的过程，然后填空．解：因为1/1×3=1/2（1/1-1/3），1/3×5=1/2（1/3-1/5）…1/9×11=1/2（1/9-1/11）所以...”主要考察你对“规律型”
等考点的理解。
因为篇幅有限，只列出部分考点，详细请访问。
探究题是近几年中考命题的亮点，尤其是与数列有关的命题更是层出不穷，形式多样，它要求在已有知识的基础上去探究，观察思考发现规律．（1）探寻数列规律：认真观察、仔细思考，善用联想是解决这类问题的方法．（2）利用方程解决问题．当问题中有多个未知数时，可先设出其中一个为x，再利用它们之间的关系，设出其他未知数，然后列方程．
与“阅读下面计算1/1×3+1/3×5+1/5×7+…+1/9×11的过程，然后填空．解：因为1/1×3=1/2（1/1-1/3），1/3×5=1/2（1/3-1/5）…1/9×11=1/2（1/9-1/11）所以...”相似的题目：
右图是我国古代的“杨辉三角形”，按其数字构成规律，请在图中第八行所有○中填好应填的数字，则这前8行36个数的和等于&&&&257256255254
观察下列各式：21×2=21+2，32×3=32+3，43×4=43+4，54×5=54+5…（1）用含n的式子表示这个规律是&&&&．（2）n=100时，请写出相应的式子：&&&&．
填在下面三个田字格内的数有相同的规律，根据此规律，请填出图4中的数字依次为&&&&，&&&&，&&&&，&&&&．
“阅读下面计算1/1×3+1/3×5+1/...”的最新评论
该知识点好题
1已知整数a1，a2，a3，a4，…满足下列条件：a1=0，a2=-|a1+1|，a3=-|a2+2|，a4=-|a3+3|，…，依此类推，则a2012的值为&&&&
2对点（x，y）的一次操作变换记为P1（x，y），定义其变换法则如下：P1（x，y）=（x+y，x-y）；且规定Pn（x，y）=P1（Pn-1（x，y））（n为大于1的整数）．如P1（1，2）=（3，-1），P2（1，2）=P1（P1（1，2））=P1（3，-1）=（2，4），P3（1，2）=P1（P2（1，2））=P1（2，4）=（6，-2）．则P2011（1，-1）=&&&&
3根据下面这一列数的规律，可知囗内的数为&&&&-6，-1，-2，+3，2，7，囗
该知识点易错题
1设n，k为正整数，A1=√(n+3)(n-1)+4，A2=(n+5)A1+4，A3=(n+7)A2+4…Ak=(n+2k+1)Ak-1+4，已知A100=2005，则n=&&&&
2根据下面这一列数的规律，可知囗内的数为&&&&-6，-1，-2，+3，2，7，囗
3将正偶数如图所示排成5列：根据上面的排列规律，则2010应在&&&&
欢迎来到乐乐题库，查看习题“阅读下面计算1/1×3+1/3×5+1/5×7+…+1/9×11的过程，然后填空．解：因为1/1×3=1/2（1/1-1/3），1/3×5=1/2（1/3-1/5）…1/9×11=1/2（1/9-1/11）所以1/1×3+1/3×5+1/5×7+…+1/9×11=1/2（1/1-1/3）+1/2（1/3-1/5）+1/2（1/3-1/7）…+1/2（1/9-1/11）=1/2（1/1-1/3+1/3-1/5+1/5-1/7…+1/9-1/11）=1/2（1/1-1/11）=5/11以上方法为裂项求和法，请类比完成：（1）1/2×4+1/4×6+1/6×8+…+1/18×20=___．（2）在和式1/1×3+1/3×5+1/5×7+…+___=6/13中最未一项为___．”的答案、考点梳理，并查找与习题“阅读下面计算1/1×3+1/3×5+1/5×7+…+1/9×11的过程，然后填空．解：因为1/1×3=1/2（1/1-1/3），1/3×5=1/2（1/3-1/5）…1/9×11=1/2（1/9-1/11）所以1/1×3+1/3×5+1/5×7+…+1/9×11=1/2（1/1-1/3）+1/2（1/3-1/5）+1/2（1/3-1/7）…+1/2（1/9-1/11）=1/2（1/1-1/3+1/3-1/5+1/5-1/7…+1/9-1/11）=1/2（1/1-1/11）=5/11以上方法为裂项求和法，请类比完成：（1）1/2×4+1/4×6+1/6×8+…+1/18×20=___．（2）在和式1/1×3+1/3×5+1/5×7+…+___=6/13中最未一项为___．”相似的习题。