2025届群力考卷答案网

从而x∈(x1,0)时g(x)>0,g(x)单调递增，当x∈(0，x2)时g(x)<0,g(x)单调递减，又g(0)=0,所以当x∈(0，x2)时，g(x)<0,不合题意.故实数m的取值范围为m≤1.………12分解法二...

49B回12:47令46图像Word调整21.解：如图，过点A作AF⊥CE于点F,则∠AFE=∠AFD=90°E…1分由题意可知CD=20米，CE=66.4米，∠DAF=∠a=45°，∠EAF=∠B=30°，∠ABC=∠BCD=90°..DE...

8.甲、乙两人进行了羽毛球比赛，双方约定：先胜两局者获得比赛的胜利.若某局比赛甲先发球，则这局比赛甲获胜的概率是号若某局比赛乙先发球，则这局比赛甲获胜的...

肉为PE-号PD,所以PE=(分，得，则A正=AP+PE=(-日号3，…………………………………8分A在-3+3y+3=0,设平面ACE的法向量为n=(x,y,z),则n·AC=是2x2y=0.令x=√3，得n=(W3,-1,2W3).平...

提示：取MN中，点为H,连接OH,OP,.OH⊥MN,设直线l的方程1.由题可知：直线sinA·x+ay十c=0与bx-sinB·y十sinC=0为y-1=k(x-2),则0H=-2类，0P=√1+4=V5,HP=的斜率分别为-...

线的对称轴为直线x=-1,-1<0,.抛物线开口向,从树叶的长宽比的平均数、中位数和众数来看，B下，当x>-1时，y随x的增大而减小，当x<-1时，种树木树叶的长约为宽的2倍...

19.已知等比数列{an}的各项均为正值，a3是4a、2a2的等差中项，45=32，记bn=l0g2a2-1·(1)求数列{an}和{bn}的通项公式；(2)设数列1b.b的前n项和为，证明：刀，<2,x...

DBA(1)设AC和BD交于点O,连接PO,如图，由于P,O分别是DD,BD的中点，故PO∥BD,,POC平面PAC,BD,寸平面PAC,所以直线BD∥平面PAC.(2)在四棱柱ABCD-AB,C,D,中，底面ABCD是...

Z.swinter.The bird took off06October 13 from the Yukon-Kuskokwim Delta in Alaska,followed the usual route across the Pacific Ocean down to New Caledon...

2版华师大八年级（河南）参考答案第2期数学周刊三、解答题（共52分）18.（11分)解：可归纳为：对于任何正整数n,多项式(6+n)2-15.(每小题3分，共9分)n2一定能被12...

做题过程中，如何突破难点4版“方法点击”《学好视图的BEF=90GD票★4,B角形的性质第12期是在灯海光线(1)5学习方法报总第1377期②中小松树的2023年11月14日.D5.20星期...

2)由1)知。-1+m-02-2n+113a,即a239ba=andm=9,1-1）…7分2n+10(2n+3)22n+12n+3Sn=b+b2+.++b.9,1111,11、911139一一十23557+2n+12n+3232n+322(2n+3)3:.S.…9分又：他...

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团lL6c压I.用适当的介词或副词填空。1.The movie is very interesting.Why don't you come芳美在报社短along with us?EARNING ENGLISH2.Working outevery day is...

19:31:15⊙4念91l4l45∴该抛物线的函数表达式为y=-x-6)2+9,即y=-x2+3x:…4分(2)方案二的内部支架节省材料.理由如下：方案一：.OB=BW=NC=CM,OM=12米，3/5.OB=3米，0C...

22.(本题满分12分)如图，在三棱柱ABC-AB,C中，AB=AC=√5，BC=2,侧面BB,CC是正方形，二面角A-BC-B的大小是2π3(1)求三棱柱ABC-AB,C,的体积：(2)若点D是线段AB,上的...

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E.Positive aspirations can give you something to thrive for.F.Being empathic helps you gain a friend while challenging your perspective.G.There's some...

A:You look great,John.Do you exercise a lot?B:(I)A_It makes me full of energy(能量)all day..(三)双宾语、动词不定式A:(2)DB:My favorite sport is running...

A.Sharing your achievements can help you get far.B.A good workout can be as simple as a 15-minute walkC.Before you begin a workout,set a goal you want...

必修二UNIT5 TOPIC TALK,LESSONS1&2综合评估参考答案及部分解析参考答案1-5 BCBAA 6-10 CABAC11-15 BCABC 16-20 ACCBB21-25 ABDAD 26-30 CBBCC31-35 ADDBB 36-40...

Ⅱ.词汇运用L.单项选择用括号内所给单词的适当形式填空。B)1.It's usually warm in the daytime,but during the21.Can you tell me by whom the talk will be giv...

第Ⅱ卷（非选择题部分）第二节语法填空（共10小题；每小题1.5分，满分15分）阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式It is familia...

第二节（共10小题；每小题1.5分，满分15分）9bd1im1u009uog阅读下面短文，在空白处填人1个适当的单词或括号内单词的正确形式。Chinese scientist Yuan Longping,...

答案： One possible version: Dear Lucy, I'm so glad to receive your email and know you're coming to my hometown in the winter vacation. You're welcome...

听第9段材料，回答第13至16题。 13.Where is the man from? A.Britain. B.Kenya. C.The US. 14.Where does the man want the box to be picked up from? A.Post...

4.B根据最后一段Scheier说的话可知，Scheier认为Runway of Dreams Foundation在过去几年里取得的成绩归功于她对这个N 事业的热爱。

11.What did the man think was the most difficult part during the mountain climbing? A.The dangerous ice. B.The sharp rocks. C.The deep snow. 12.How lo...

Fort Wayne Children's Zoo This park was designed for little ones.The 20-foot-high tree house in the Indonesian Rain Forest has an entrance that only s...