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点P(3,9)关于直线x+3y-10=0的对称点的坐标为? (x+y²)+(2x+1/1×2·y²）+(3x+1/2×3·y²)+……+(9x+1/8×9·y²) 1.(x²-9)/(x²+2x²+x)*(3x³+9x²)/(x³-3x),其中x=-1/32.2x/（x³+2x²+x）除以（x-1）/（x²+x）,其中x=-23.(4x²-1)/（2-4x）除以（4x²+4x+1）/x,其中x=-1/4 制作人体口腔上皮细胞装片时,在载玻片上滴的是（ ）而不是蒸馏水,染色时用到的染色溶液是（ ） 一道SAT语法题,OC里面的,By including pieces of cloth,newspaper,wallpaper,and other materials in his work,(Picasso was influential,with his innovation,over) twentiety-century art.划线处是括号里的内容.这里答案说是awkward phrasing 一道sat oc语法题~~~~~~~~~the newspaper reported that （ having） the increase in the minimum wage, many people are still having trouble making ends meet. reported难道时态没有错吗?不是应该用现在时吗?还有有人说having既可 一道SAT OC 语法题> 点(1,2)关于直线2x-3y-9对称的坐标 我们容易发现:当正比例函数与反比例函数有交点时,这两交点关于原点中心对称,你可以利用这一结论解决问题.如图,在平面直角坐标系中,正比例函数与反比例函数y=√3/x的图象分别交于第一 sat oc 语法题By the end of the eighteenth century, watchmaking technology had greatly improved, （and they were standard equipment for military personnel.）(A)and they were standard equipment for military personnel (B)so it was standard equipm 一道SAT OC上的语法题 New York City is an important center of American Buddhism,in part because its residents included immigrants from most of the countries that have strong Buddhist traditions.为什么 included 要改为 that 光线经过点P(2,3)射到直线x+y+1=0上,反射后经过Q(1,1)点,求反射线所在的直线方程. SAT OC语法题【A recent discovery is the finding that】 people who both drink and smoke 【are】 greater cancer risks than those who do only of these things.A.It has recently been discovered that主语从句结构 但是我就想问原句有没 SAT OC第四套 一道语法题求解释(From) its modest beginnings as a series of brief vignettes (and) its establishment as the longest-running prime-time comedy series on television,The Simpsons has transformed (the way that) both audiences and t She wants to go to store with her parents.这句话有错吗? 求高中英语单词（新人教版）MP3,有的发我邮箱：15244136464@139.com waiter可以指女服务员吗在一般情况下,女服务员是不是服务成waiter?或者称呼时应该怎么称呼?waiter是不可以指女服务员还是一般情况下不这样用呢?如果指女性是不是就是错误的说法. she goes to the zoo with her parents 改为一般过去时 waiter是只能指男服务员吗? waiter 服务生会遇到的一些英文词请写下一些常用的词,比如说筷子,汤匙什么的. 四级英语单词星火乱序好还是新东方乱序好有人用过吗?我两本都有,但我选择恐惧症了,星火里面附有光盘小游戏能巩固单词,但是里面的单词意思解释没有新东方绿皮里面的全面.他们各有各 实验题里面有一种题目是给你一条纸带然后问你从中能看出碰撞过程经历了多久.是看哪一块的时间? 新东方四级单词乱序版和普通版哪个好 寒假作业本七年级萍萍住在宁波,她寒假里想去哈尔滨看冰灯,请你给她设计一条旅游路线,要让她吃好,看好,玩好,再带一些有当地特色的纪念品回来.教一下啦.拜托,我不会才问的耶! 诚信对企业的重要性的小故事举一个小故事,正反两个方面都要 请教人教高一下生物问题说下我选择的答案对错,错误请帮忙指出理由,并解释下正确答案 下面哪句话是错误的?（我选4）1,合成mRNA的主要场所在细胞核 2.由一条mRNA合成的最终氨基酸序列都相 因为我的必修一和必修二基本没怎么听. |x-2|除以2-x=1 56除以87 有谁知道啊啊啊啊啊啊!?速度啊啊啊啊啊啊啊啊啊 速速速速度度度度度 ! be related with与 be related to的区别?意思都一样 哪方面有区别? 12.8除以15那个最简分数?快啊啊啊啊啊啊啊啊啊啊啊啊!急! 计算 分式的加减法.b/(a+b)-a/a-b (a-b/ab)+(b-c/bc)+(c-a/ca)(1/x-1)-(1/x+1)-(2/x^2+1)(4/a+2)+a-2