汽油 疯狂猜图

左一块等边三角形地的三条边上栽树,三个顶点的树都算上,每边100棵树.已知相邻两棵之间相距5米,这块正三角形地的周上是多少米? 已知集合A={x丨1 这是什么种类的树? 已知集合A={x/1 英语姓名HELEN的中文含义 英语翻译two hours later ,my friend telephined me from the flat.at that moment,he said,he was watching TV after he had a wonderful meal.he had two eggs and had helped himself to some cold chicken from the refrgerator .then he said ,he was drinking 英语翻译Dear Jackiei'm very glad to get your letter.you asked me about my hobby.well,i enjoy doing many things when i am free.l like dacing very much.my mother taught me to draw when i was four years old l like drawing animals such as pandas,dogs 英语翻译an old friend of mine telephoned me from the railway station to tell me that he had come from Canada and was going to stay with me .i was still at the office at that time,so after explaining where my flat was.i told him that i had leftthe 已知集合A={x|x3},B={x|x^2+ax+b≤0}若A∩B=（1,4】,AUB=R,求a+b的值 已知集合A={x|x^2-3x+2=0},B={x|x^2-ax+a-1=0},AUB=A,则A的值为 1.已知三角形ABC,延长BC到D,使BC=CD,取AB的中点F,连接FD交AC于点E.问1：求AE/AC的值 2：若AB=a,FB=EC,求AC的长.2.直线Y=4/3X与双曲线Y=K/X（X>0）交于点A.将直线Y=4/3X向右平移9/2个单位后,与双曲线Y=K/X（X>0 设集合A=｛-2｝,B=｛x｜ ax+1=0,a∈R｝,若A∩B=B,求a的值. 哪位高手能帮我解决一下这个初二数学题?{x=1 ｛x=0{y=3 ｛y=-2 都是方程ax-y=b的解,求a与b的值注意：括号是方程组那个括号、请写出解答过程、谢谢、分不够的话再加。 求解决,初二数学题 五年级二班人数不到一百人,每三人一组余二人,每组四人余三人,每组五人余四人,全班多少人?列式 不超过一百人,每组三人余两人,每组四人余三人,每组五人余四人,问有多少人? 九年级仁爱英语14页作文 世界水日,世界地球日,世界环境日分别是哪一天? 仁爱版九年级上英语 p104作文 同学们去植树,3人一组,5人一组或9人一 组都正好分完,没有剩余.参加植树的同学在80~100人之间,最多有多少人 两句环保宣传口号例： 爱护绿化,人人有责. 两句保护环境的口号 满足条件{1,2}真包含于A,A又包含于{1,2,3,4,5,6}的集合A的个数是?这是我一本参考书上的例题,它的解析是：A中必含有1,2,再从3,4,5,6中至少选取一个即可.故A 个数为C4^1+C4^2+C4^3+C4^4=15,（C4^1的那种形 若{1,2}含于A含于{1,2,3,4,5}则满足条件的集合A的个数是哪八个？ 若{1,2}包含于A包含于{1,2,3,4,5}则满足条件的集合A的个数是多少个 满足条件{1,2}真包含于M包含于{1,2,3,4,5}的集合M的个数是（ ） 已知集合A={x│-1≤x≤1},B={x│-1≤x≤a},且(A∪B)是(A∩B)的子集,则实数a= 已知集合A={x|1 地理! 关于2009地球日,环境日,XXX日,等等的日期和主题?急! 已知集合A={x||x|=a}且A是B的子集 则实数a的值为? 设集合A={1,2},则满足A∪B={1,2,3}的集合B的个数是 设集A={1,2}则满足AB={1,2,3}的集合B的个数是?