已知抛物线x2=y,O为坐标原点. (Ⅰ)过点O作两相互垂直的弦OM,ON,设M

题型:解答题

问题:

已知抛物线x2=y,O为坐标原点.

(Ⅰ)过点O作两相互垂直的弦OM,ON,设M的横坐标为m,用n表示△OMN的面积,并求△OMN面积的最小值;

(Ⅱ)过抛物线上一点A(3,9)引圆x2+(y-2)2=1的两条切线AB,AC,分别交抛物线于点B,C,连接BC,求直线BC的斜率.

考点:圆锥曲线综合
题型:解答题
When I was about 12 years old, I really wanted a new bike! I __31__ my parents my birthday wish, but I knew there was little hope because my family could __32__ have that money.
  On my birthday my parents told me they had my __33__ outside in the back yard. At once, I __34__ out to the yard. There was my bike, __35__ it wasn’t the bike that I thought it would be. This one was pink, old and worn with age. It was so __36__! I thought I __37__ my parents’ feelings because I could see the disappointment __38__ their faces and I was sure they could see it on mine. I __39__ the old bike and rode it, feeling __40__ that I had made my parents feel this way. So I put on a smile, rode as fast as I could and didn’ t __41__.
  As time went by, I began to understand my parents gave me __42__ much more than just a rusty(生锈的)old bike. They gave me a life lesson about __43__. When you give something out of love, it doesn’ t matter what it is in fact. What matters is the love that is in it. I like to remember this __44__ because giving a gift is not about money. It’s about how much love you can feel from it. Do remember, a gift that __45__ two dollars isn’t any less valuable(有价值的)than one that costs one hundred dollars, or even more.
小题1:
A.talkedB.spokeC.saidD.told
小题2:
A.hardlyB.quicklyC.slowlyD.easily
小题3:
A.guitarB.giftC.cakeD.card
小题4:
A.rushedB.rodeC.climbedD.came
小题5:
A.andB.orC.butD.because
小题6:
A.excitingB.interestingC.relaxingD.disappointing
小题7:
A.likedB.hatedC.hurtD.thanked
小题8:
A.onB.inC.atD.for
小题9:
A.got inB.got onC.got offD.got up
小题10:
A.surprisedB.excitedC.happyD.bad
小题11:
A.look aheadB.look backC.come upD.come down
小题12:
A.anythingB.nothingC.somethingD.everything
小题13:
A.loveB.moneyC.friendshipD.knowledge
小题14:
A.ideaB.newsC.adviceD.story
小题15:
A.spendsB.costsC.paysD.offers
题型:解答题
学校在小红和小明两家之间的一段公路边.放学后,两人同时向各自家里走去.小明每小时走
18
5
千米,小红每小时走3千米,
5
12
小时后两人同时到家.两家相距多少千米?
题型:解答题

计算机网络按传输的距离分为______、______两种类型。

题型:解答题

根据新《商检法》的有关规定,法定检验商品的报检义务人只限进出口商品的收、发货人。( )

题型:解答题

近三年天津高温津贴发放标准是多少?

更多题库