职高,高一数学题。Hi,学霸、学民们,愿意的请讲解,谢谢(*°∀°)=3?

按照等差数列性质就可以



a3+3d=a6所以d=-2
a7=a6+d=0往后都是负数所以Sn最大应该是n等于7的时候

  • Hi銆瀛﹂湼浠,鎬忔潵鎬ユ晳鎴
    绛旓細鍓嶄袱aa鏈鍚庝竴涓槸d
  • 璇峰府蹇欒В閲婁笅鍥涙哀鍖栦笁閾佸拰HI鐨勫弽搴斿師鐞,璋㈣阿瀛﹂湼浠
    绛旓細鍥涙哀鍖栦笁閾佸厛涓庢阿纰橀吀鍙嶅簲 鐢熸垚涓変环閾佺瀛 涓変环閾佹哀鍖栫绂诲瓙鐢熸垚纰樺崟璐ㄥ拰浜屼环閾
  • 瀛﹂湼,甯垜鐪嬩竴鐪棰樼洰!!~~~
    绛旓細Millie锛Hi, Mum, now, are you ready to see my school?Mum锛欻i, dear. Your school looks beautiful. The playground is so big.Millie锛歒es,it is. Let me show you around. We鈥檙e now in front of the classroom building. There are 18 classrooms in it. My classroom is on the ...
  • 璺眰瀛﹂湼璋㈣阿锝鏁板娓f福!hi hi
    绛旓細璺眰瀛﹂湼璋㈣阿锝鏁板娓f福!hi hi  鎴戞潵绛 1涓洖绛 #璇濋# 灞呭闃茬柅鑷晳鎵嬪唽 鍖垮悕鐢ㄦ埛 2014-09-17 灞曞紑鍏ㄩ儴 鏇村杩介棶杩界瓟 杩界瓟 瀵逛笉璧 鎴戝彂鐜版垜鍘熸潵绛旀閿欎簡 鏈洖绛旂敱鎻愰棶鑰呮帹鑽 宸茶禐杩 宸茶俯杩< 浣犲杩欎釜鍥炵瓟鐨勮瘎浠锋槸? 璇勮 鏀惰捣 涓轰綘鎺ㄨ崘:...
  • 13.12棰,瀛﹂湼鍛
    绛旓細瑙h涔欒溅姣忓皬鏃惰x灏忔椂 閫熷害鍜孹鐩搁亣鏃堕棿=鎬昏矾绋 锛68+x锛塜3.5=455 68+x=455梅3.5 68+x=130 x=130-68 x=62
  • 鏁板棰銆傘傘
    绛旓細鐙楃嫍绗煎瓙浜笢-缁煎悎缃戜笂璐墿鍟嗗煄,鍟嗗搧榻愬叏,鍝佽川鍑轰紬,璁╂偍瓒充笉鍑烘埛,鐣呬韩HI璐!鍖椾含浜笢涓栫邯淇℃伅鎶..骞垮憡 101鏁欒偛灏忓鍥涘勾绾鏁板鍩逛紭琛ョ己,楂樻晥鎻愬崌灏忓鍥...骞垮憡 杈呭楂樹腑鏁板_瀛﹂湼楂樿冩彁鍒嗘妧宸鍋氬埌杩7鐐筥绋充笂985閲嶆湰 鏌ョ湅璇︽儏 cac.wzswjy.com 5銆100鍚嶅笀鐢熺豢鍖栨牎鍥,鑰佸笀姣忎汉鏍3妫垫爲,瀛︾敓姣2浜烘牻1妫,鎬诲叡...
  • 鏈変竴閬撻涓嶄細,璇瀛﹂湼甯繖,璋㈣阿
    绛旓細鍥炵瓟锛氭彁鍙1 绛旀鏄1
  • 鍒濅笁鏁板棰,璋㈣阿瀛﹂湼浜
    绛旓細涓銆侀夋嫨棰橈紙12脳3鍒嗭級1銆佷笅鍒楄绠楁纭殑鏄紙 锛堿銆 B銆丆銆 D銆2銆佽嫢鍑芥暟鍦ㄥ疄鏁拌寖鍥村唴鏈夋剰涔夛紝鍒欑殑鍙栧艰寖鍥翠负锛 锛堿銆侊紴1 B銆 鈮1 C銆佲墵1 D銆佲墺0涓斺墵1 3銆佸鏋滐紝鍒檟鐨勫间负锛 锛堿銆伮1 B銆伮2 C銆0鎴2 D銆0鎴-2 4銆佽嫢鍏充簬x鐨勬柟绋嬫湁涓鏍逛负...
  • 绗簩鍜屼笁棰,鎷滄墭瀛﹂湼浠
    绛旓細鍥炵瓟锛hi fine what spell it what color
  • 璇瀛﹂湼浠ヤ笂闈袱涓棰樼洰涓殑涓涓啓浣,涓嶅皯浜5鍙ヨ瘽(鍏堥噰绾冲悗缁欑瓟妗堢殑婊...
    绛旓細Hi.Yesterday is rainy to guang zhou.Today is windy to guang zhou.Yesterday is cool to shanghai.Today is cloudy to shanghai.Yesterday is clod to Baijing.Today is snowy to Baijing....
  • 扩展阅读:高一数学全部课程视频 ... 高一数学网上免费视频 ... 高一数学试卷全套 ... 职高高一数学集合视频 ... 高一数学集合测试题 ... 高一数学课本上册 ... 高一数学视频全套 ... 高一数学卷子可打印 ... 职高高一数学视频教程免费 ...

    本站交流只代表网友个人观点,与本站立场无关
    欢迎反馈与建议,请联系电邮
    2024© 车视网