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已知（1/cosA）-（1/sinA）=1,则sin2A的值为?已知5cos（A-（B/2）+7cos（B/2）=0,则tan（A/2)tan(A-B/2)=?积化和差我们老师上课稍微讲了一点点，但是现在高一不学了……所以……额…… 这个第一题都没 1.函数f（x）在R上有意义,在区间[a,b]上的最小值为m,那么f(x+4)+3在区间[a-4,b-4]上有最小值为_______2.函数y=lg（1-x）+lg（1+x）的图像关于________对称 英语题（就划线部分提问.）1.John comes from New york.划线部分：(New york)2.Jack is 12 years old.划线部分：(Years old)3.Simon wants to be an engineer.划线部分：(an engineer)4.there wrwr eight people in my family in 1951.划 对划线部分提问 （英语）The clock “I bought yesterday”didn't work.对引号部分提问（ ）（ ）didn't work .已知函数y=√mx^2-6mx+m+8 (这些都在根号下)的定义域为R,则m的取值范围是? cosα=m(|m|≤1),求tanα. 已知函数y=x^(a²-4a-1)是偶函数,且在（0,正无穷.）上是减函数,则整数a的值是_____.PS:如果像y=x^（-4）这种算么?图像大概是怎么样的 若函数y=f（x+1）的定义域为【 - 2 ,3】,则函数y= f (2x-1)的定义域为希望您告诉我这题是怎么解得,答案不重要, 已知物体在共点力F1=(lg2,lg2）,F2=(lg2,lg5)的作用下产生位移S=(1,2lg5）,则共点力对物体所做的功W为（）A．2 B．1 C．lg5 D．lg2 如何判断是否是非限定性定语从句下面两题不用非限定性语从句不行吗1 he lived in london for 3 months,during _____ time he learned some english.a thisb that c whichd same2 the road conditions there turned out to be very good, how can iuse this washing machine?well,just refer to the ——.A.explanation B.expressions c.introductions D.directionsJim was late for two classes this morning .He said that he forget both of the ——A.rooms number B.room number C.room’s number 第36题 这句后面是定语从句还是宾语从句?如何判断的呢? 一道物理题（回答时请写步骤）我国历史上的冰透镜,可以利用它聚集日光,可以使纸点燃.冰遇火会融化,但做成冰透镜却可以取火,这是为什么? 高中英语定语从句中,关系词的成分判断辅导书上说先行词在从句中的成分不同,须用不同关系词代替.还是晕,举例children are always happy on the day —— the school year ends .这句话要用which 还是when 那I 速回 一道物理题 请写详细步骤某小型水电站输出功率为20kW,输电线总电阻是6(电阻的单位打不出来)（1）若采用380V输电,求输电线路损耗的功率.（2）若改用5000V高压输电,用户端利用 n1:n2=22:1 高中英语定语从句和同位语从句的辨析.I would like to share a story ____ music overcomes a physical barrier and makes a connection with a young student.为什么填的是where?我知道这是地点抽象化,但是为什么不能理解 一台电风扇1.5h消耗电能5.4×10的5次方J,这台电风扇的功率是? ____should not become a serious disadvantage in life and workA.to be not tall B.not being tallC.being not tall D.not to be tall 麻烦详细说明理由I found out one time that doing a favor for someone could get you into a lot of trouble.I was in the eighth grade at the time,and we were having a final test.During the test,the girl sitting next to me whispered something,but ___should not become a serious disadvantage in life and workA.to be not tall B.not being tallC.being not tall D.not to be tall 英语翻译1.hate ___when people talks with their mouth fullA it b.that c.these d.them2.was __that I met at the railway station the other day A.it you b.not you c.you d.thay you 3.It is the ablity to do the job __matters ,not where you come from or 怎样区分名词性从句和定语从句? 名词性从句和定语从句的区别是什么我分不清 请问怎么区分名词性从句和定语从句?做它们的题目总是搞错.希望回答能够 简洁凝练 一点, 名词性从句和定语从句有什么区别?如何做它们的单选择题. 1.如图所示,在盛有某液体的圆柱形容器内放有一木块A,在木块的下方用轻质细线悬挂一体积与之相同的金属块B,金属块B浸没在液体内,而木块漂浮在液面上,液面正好与容器口相齐.某瞬间细线 高中英语定语从句1.定语从句怎么还原2.怎么看关系代词和关系副词在从句当中担任什么成分.如she is the girl who/whom i will go to shang hai with .这里的who是代替宾格的whom,为什么.怎么看?又怎么还原 高中英语定语从句怎么做 高中英语之定语从句,1.I'll remember the time( )we spent together in the country.A.that B.when C.during which D.at which2.Much ( ) I have read has been nonsense.A.which B.as C.that D.where3.We've all heard of Thomas Edison,( ) invented the ele 关于高中英语中的定语从句(超急）句型转换1.The tree is quitr tall.He is climbing it.The tree______ _______ _______is quite tall.2.Tina is a top student .The school gave a medal to her for winning the writing compettion.3.Students lik 请教一道物理有关功率的题 请写明详细计算过程我国农村使用的一种钢架水泥壳抛物面太阳灶.用30分钟可将4千克与室温{26.5摄氏度}相同的水刚刚烧开,若不计热损失此时这个太阳灶的功率为? 英语练习.三空填什么.