已知椭圆c的两个焦点 PF1⊥F1F2 PF1=4/3 PF2=14/3若直线l过圆x²+y²+4x

一棵深度为6的满二叉树有 个分支结点和 个叶子,请问应该怎么看呢? 小东家离学校18.75千米,他每天骑车上学,往返一次共需2.5小时,小东平均每小时行多少千米? 请问set for anything less...的意思?请问下句话的意思?所含短语?感激不尽!When you have been very deeply in love settling for anything less and remaining satisfied is not in my nature. do you have anything for less 对话中有出现 谁有settle for less 的歌词 before you exit 的歌 can't ask for anything less 是嘛意思?不定代词还有类似的表达方式吗?哪位同志会解答一下啊！要地道的！ 保护鸟的广告 20字+ . 快啊,有关保护鸟的公益广告有关保护鸟的公益广告1到2则, 执行下列程序段后,y的值是() int x=1,y=5; do{y-=x;++x;} while(--y 上体育课时,同学们站方队体操,从前后左右数,小芳都是第三个,一共有多少名同学做体 四年级同学进行体操表演,从左数小红排第10 个, 从右数小红排第9 个, 从前数她排第 8 个, 从后数她排第6个四年级学生共有多少人? 人为什么要保护鸟 负数有奇偶之分吗 less my sister drives less ____(well) than my brother.答案上是better.有点别扭,请问有谁知道为什么吗? 负数有奇偶性吗?如-3、-2、-1 less but better 的中文意思 the less the 1.Would you like to help me c____ a present for my mother?2.She has l____ of friends in China.第二题是 2.She has l____ of friends in China. 负数不分奇偶的-2是偶数吗,-3是奇数吗 选词填空 This is my ... he's... he's... 词语：boy daughter father friend mother son teacher girlthis is my... he's... she's... less better than 负数有没有奇偶之分 关于保护鸟的宣传标语（修辞）一定要有修辞! 负数有无奇偶 谁能帮我写:关于保护鸟的标语 my mother look like急用 I look like my mother改为一般疑问句 They say I look like my mother .同义句 They say that I __ __ my mother My sister look like my mother My sister look ---- ----- ----- my mother同义句为什么 有一台收割机,作出宽度是1.8米.每小时行5千米,大约多少小时可以收割完的这块地?图是梯形高是100米上底是200米下底是330米 有一台收割机,作业宽度是1.8m.每小时行5千米,大约多少小时可以收割完左边这块地? 有一台收割机,作业宽度是1.8m.每小时行5km,大约多少小时可以收割完这块地?是一块直角梯形,上底200m,下底330m,高100m.