Train services are now back to______after three days of typhoon.
Train services are now back to______after three days of typhoon.
如图,∠MON=30°,点A1在射线OM上,过点A1作A1B1⊥OM交射线ON于点B1,将△A1OB1沿A1B1折叠得到△A1A2B1,点A2落在射线OM上;过点A2作A2B2⊥OM交射线ON于点B2,将△A2OB2沿A2B2折叠得到△A2A3B2,点A2落在射线OM上;…按此作法进行下去,在∠MON内部作射线OH,分别与A1B1,A2B2,A3B3,…,AnBn交于点P1,P2,P3,…Pn,又分别与A2B1,A3B2,A4B3,…,An+1Bn,交于点Q1,Q2,Q3,…,Qn.若点P1为线段A1B1的中点,OA1=√3,则四边形AnPnQnAn+1的面积为___________________(用含有n的式子表示).
如图,在平面直角坐标系中,▱OABC的顶点A,B在第一象限内,顶点C在y轴上,经过点A的反比例函数y=k/x(x>0)的图象交BC于点D.若CD=2BD,▱OABC的面积为15,则k的值为______.
如图,在矩形ABCD中,AB=6,BC=10,以点B为圆心、BC的长为半径画弧交AD于点E,再分别以点C,E为圆心、大于1/2CE的长为半径画弧,两弧交于点F,作射线BF交CD于点G,则CG的长为__________________.
如图,在△ABC中,AC=4,∠A=60°,∠B=45°,BC边的垂直平分线DE交AB于点D,连接CD,则AB的长为_________________.
The song ____My heart will go on is liked by the young people.
Have you decided when_____?
Yes, tomorrow morning.
_______terrible weather we`ve been having these days!
关于x的一元二次方程x2+2x﹣k=0有两个实数根,则k的取值范围是________.
It`s _______here. We can`t work long hours here.