在平面直角坐标系中，点O是坐标原点，过点A（1，2）的直线y=kxb交x轴交于点B，且三角形AOB面

求出粉率是多少 伊乐翻译 凹,凸,尴尬,五笔怎么打? 怎么计算出勤率,出粉率,出油率,成活率. 高数函数问题,求大神帮忙!第5题是∫xe^xdx,第六题下面是0上面是1. 出油率类的题 ∫ arccose^x/e^xdx 什么是出油率 ∫(1+lnx)/xdx的不定积分,给给力! 在公式中输入“=$C1+E$1”是什么应用拜托各位大神 已知a*a+2b*b+3c*c=6,求a+b+c的最小值?已知a*a+2b*b+3c*c=6,求a+b+c的最小值?急, 不等式 设a,b,c ∈R+,则（a+b+c）（1/(a+b)+1/c）的最小值是 数学求极限要步骤 Legal Nature怎么翻译? 求极限,要大致步骤. 英语翻译The compatibility of pneumatic equipment is the responsibility of the personwho designs the pneumatic system or decides its specifications 1.某商场按定价销售某种电器,每台可获利48元,按定价的9折销售该电器6台与将定价降低30元销售该电器9台所获得的利润相等,该电器每台进价和定价各是多少?2.甲,乙两人做加法,甲将其中一个 人生一世,草木一秋,花有重开日,人无少年时. my uncle lives two floors a____ us a+b+c=16,2a+4b+10c =50 要怎么算?a≥1，b≥1，c≥1 2(2a-b)-[4b-(-2a+b)]怎么算 计算【(2a-b)^2-4b(a+1/4)】×(2a^2+b^2) a^2+b^2-2a+4b+√c+3+5=0Thank You 已知等腰三角形的顶角为α,底角为β,且cosα=7/25,求sinβ,cosβ的值 sin(B/2)=cos(A+B/2) 则B/2+(A+B/2)=90——B+A/2=90 所以为等腰三角形sin(B/2)=cos(A+B/2)则B/2+(A+B/2)=90——B+A/2=90则C+A/2=90——B=C所以为等腰三角形没看明白第一步怎么到第二步的 有一个等腰三角形ABC的底角A的sin值是3/5,求这个三角形的顶角的sin,cos和tan的值 还有一个 已知sina=2,并且a属于(0,3.14/2),求sin2a*cos(2a-3.14/4)的值 a就是阿尔发,3.14就是PAI 这个题目我的思路是这样的 请朋友们帮我解道数学题,越快越好两个机场相距1400千米,甲、乙两架飞机分别从两个机场同时相对飞行.甲机每小时飞行360千米,乙机每小时比甲机少飞行20千米.1.经过几小时相遇?2.相遇时甲机 英语翻译Good News about GamingHere is some good news for all of you who like to spend a lot of time with your Xbox 360 or Wii.Many experts say that playing video games is good for you!It certainly helps you to see things,not just the things in fr 英语翻译Here is some good news for all of you who like to spend a lot of time with your Xbox 360 or Wii.Many experts say that playing video games is good for you!It certainly helps you to see things,not just the things in front of you but everyth 英语翻译You would see more things and see them more quickly than she could.The experts also say video games teach you how to cooperate and get along with others.Games players talk with each other a lot and help each other improve their scores.It' 啥规律,想不通,1,8 ,9 ,4 ,() ,1/6A.3 B.2 C.1 D.1/3 -2,-8,0 ,64,()A.-64 B.128 C.156 D.250 你能发份2010年7月1日至2011年6月30日国际、国内发生的重大事件.