新驾照考试科目二

1-12月英文 近视镜片的度数是－500时,它的焦距是多少? 设abc均为正数,且a+b+c=1 求证 1.a²b²+b²c²+c²a²≥abc 2.设abc均为正数,且a+b+c=1求证1.a²b²+b²c²+c²a²≥abc2.a²+b²+c²≥9abc 设a b c为正数,且a+b+c=1求a²b²+b²c²+c²a²≥abc 求英语答案啊告诉我为什么要那么选额19.I would like to know how long____Chinese before you came to China. A.have you studied B.you have studied C.had you studied D.you had studied20.It's going to rain.I 如图,点c是线段AB上的一点,点D,E分别是线段AC,BC的中点,如果AB等于a,AD等于b,其中a大于2b,那么CE等于什么 如图,点C是线段AB上的点,点D是线段BC的中点,若AB=12,AC=8,则CD= 如图,点c是线段ab上的一点,点d是ac的中点,点e是bc的中点.如果ab等于a,点c是如图，点C是线段ab上的一点，点D是AC的中点，点E是BC的中点。如果AB等于a，点C是线段AB延长线上的一点，求线段DE的 1.设A=｛2,-1.x²-x+1｝B=｛2y,-4,x+4｝C=｛-1,7｝且 A∩B=C 求x y的值2.设A=｛a²,a+1,-3｝ B=｛a-3,2a-1,a²+1｝ A∩B=｛-3｝求a的值要有过程啊 IxI=3 IyI=5 Ix+yI=-x-y x-y的值 若IxI=3,IyI=5,且Ix-yI=-x-y,求x-y的值 若IXI=2,IyI=3,则Ix+yI值是多少 初二数学已知IxI 若lxI=3,IyI=5,且Ix+yI=-x-y求x-y的值 如果定义一个指针且指向一个已经确定指针的首地址,那么这个刚定义指针的改变会影响原来的指针吗? 三角函数诱导公式使用时…怎么确定正负号.求详解 若IxI=5,IyI=2,且x>y>0,求x+y的值 已知|x|=0.28,|y|=0.88,且x除以y大于0,求x-y的值 世界第二大高峰是哪座山? 世界第一高峰是我国的什么山峰? 三角函数cos怎么定正负 世界第二高峰是什么山脉?是什么山? Although the boy studies very hard,___he can't do well in all his subjects.A.but B.and C.yet D.so是不是B?It ____two years since I came here.A.is B.has been C.was D.A and B是选A还是B还是D? （ ）Japan is ____ the east of China.A.on B.in C.to D.from( )Hunan is _____ the south of Hubei.A.in B.on C.lie D.from说明理由,尽量详细点. 1.She ( )the guitar until she finishes her homework.A.didn't practiseB.hasn't practisedC.practiseD.won't practise2.As the saying ( ),"Where there is a will,there is a way."A.go B.goesC.going D.went还有 as goog as 和as well as的区别 1.The second-hand car Jack bought was almost new; ________ it was in good condition.A.however B.besides C.although D.while 2.The results of his experiment affords a sound ________ for statement.A.reason B.cause C.basis D.effect说明原因 1.The old woman kept one black dog and two white______A.one B.ones C.those D.one's我觉得应该选A.但是题目上是两个白色的狗..那就应该选B说实话..关于one这个词我不大会用.2.He began to teach_____ English last year.A.he B 世界第二高峰是哪座山峰? 世界第二高峰是哪个国家的哪座山脉哪个山头?众人皆知世界第一高峰是珠穆朗玛峰,但是又有多少人知道第二高峰是谁呢? 设函数f（x）=2ax的平方+（a-1）x+3是偶函数,则a=( ) 设a是实数,f（x）=a-2/（2的x次方+1）（x∈R）,试确定a的值,使f（x）为奇函数 对于f（x）=a-2/（2的x次方=1）（a属于R） ,是否存在实数a使f（x）为奇函数?f（x）=a-2/2的x次方=1 （a属于R）