右邊工字

（1）.f(x)=-(sinx)^2+sinx+a,若1≤f(x)≥17/4,对一切x属于R恒成立,求实数a的取值范围（2）.f(x)=sin(wx+φ ),w>0,0≤φ ≥π（pai),f(x)是R上的偶函数,关于点M（3π/4,0）对称,在[0,π/2]单调,求φ ,w的值 I want to go somewhere in (east) China this winter.I want to go somewhere in (east) China this winter. 英语作文Things l want to do during this winter holiday 满足一下条件,文笔差点没事,也别太好.what are the things you want to do during this winter holiday?what do you like to do most?why 三角形ABC的一个顶点A(4,-1),两条角平分线的方程为:x-y-1=0,x-1=0,求BC边的直线方程 点A(1,－1)在直线l上的投影为B（3,6）则直线l的方程为?本人较苯,实在想像不出那个投影到底怎么投的… 已知椭圆2x²+y²=1,直线l与y轴交于点P(0,m),与椭圆C交于相异两点A,B,且AP=3PB（向量）,则m的范围是? it is a place that covers38km 这个a要改成the吗 this is the place that we visited yesterday.这里的that能不能省略.还有这里是不是不能用which?还是到底that作什么的宾语的时候可以省略.....我被你们弄混了..到底谁对啊？怎么有的说行 有的说不行.... then tom is the f___ to get to the classroom 高一数学函数“值域”高手速进!求值域：f(x)=x+1-根号下（2x-4） 注意：“2x-4”在根号下 PS：我是高一的初学者,刚开始学函数,所以,请学姐学长们答题时写出解题过程,因为我已有答案,但无解 I'll pick you ____at your college gate and take you straight to the station.A onB offC outD up i can __you to the railway station in my car a send b pick c ride d take 为什么选c Either you or Tom ____(go)to the park with me. Do not worry ,I have ___a car to pick up the guests at the station at 6.A.arranged B.arranged for C.prepared D.perpared for 选择B.为什么不选其他的. 帮帮忙用一元一次方程解下面的题敌军离我们8千米的驻地逃跑,时间是早晨4点,我军5点出发以每小时10千米的速度追击,7点追上,求敌军的逃跑速度是多少?方程怎么列啊! 帮忙用一元一次方程解下面的题目一个两位数,个位上的数字比十位上的数字大2各位与十位上的数字之和是10.求这个两位数。 Life is full of temptations, but also full of regret, I always．．．谁来解释下Life is full of temptations, but also full of regret, I always look at the life is too simple, too beautiful, and in this sense, I seemed to be an optimist. Down by the station歌曲背景知识 函数f(x)=ax+1/a(1-a),其中a>0,记f(x)在区间【0,1】上最小值g(a),则函数(1-a)g(a)的单调区间是 Down at the Down at the station,early in the morning.See the engines,all in a row.See the engine driver,turn a little handle.Chuff chuff chuff.And away we go. 一块直角三角形的玻璃,夹直角的两条边长都是0.6m.每平方米玻璃的价格是45元,买这块玻璃需要多少元?S= 信息检索是什么? 以长方形的长为轴旋转一周,得到一个（ ）体,长方形的长就是它的（ ）,宽就是它的（ ） Farmers are planting v_____ in the field. the farmers busy___in fieldthe sun is shining______and the wind is warm. Potatoes are()in the field by the farmers He advised the farmers ____ different plants next to each other in the same field.A.grow B.grew C.not to grow D.against growing这里选C有什么错吗? 分数单位相同的分数分母相同对吗? coreldRAW里怎么把几个对象等间距排列比如说我在我的电脑一次选中十几张图片拉入coreldRAWX4 ,在工作界面里图片都是重叠的,怎么把这十几张图片等间距排列成一行或者一列呢,是等间距啊 coreldRAW让对象沿着固定路径旋转复制比如我画一个椭圆跟矩形,要使椭圆沿着矩形的四条边进行旋转复制一周,假使椭圆的中心移到矩形中心,但选中椭圆后就很难确定矩形中心位置了 混联电路,R1与R2、R3串联,R2与R3并联.I2=I1*R3/R2+R3.R3/R2+R3怎么来的, 顺利怎么造句?