四边形有哪些图片大全

一个长方体的盒子,它的正面与上面的面积和为209平方厘米,如果它的长高宽都是素数,那么这个盒子的容积是多少?（盒子的厚度忽略不计） 求正确答案.第12题 第十二题我写的对吗.正确答案应该是多少 那位高手知道怎样把大学英语光盘中的音频 弄下来,我想把它放到MP3里听,谢谢!光盘中的文件能打开我就不会问了 大学英语光盘里面的文件怎么拷贝到MP3上?复制没用,还有没有高招? 21世纪大学英语的附带光盘是mp3格式吗,可以拷贝吗 怎样把mp3光碟复制到手机内存里? 求解初二的一元二次方程题某木器厂有38名工人,2名工人每天可以加工3张课桌,3名工人每天可以加工10把椅子,如何调配工人才能使每天生产的桌椅配套?（1张课桌配2把椅子） 12题答案多少? 急 初二英语怎么制定复习计划?还有3周就期末考试了，给我一点提示。我每次考试短文填空都很差，怎么提高？ 有谁了解的说下吧,十分谢谢了5g 短文改错求大神 求大神短文改错Last Sunday,my friends and I went to the Central Park,which I saw a sad scene.While a young couple were sitting on the bench and enjoyed the beautiful sight,they threw their rubbishes onto the ground.They didn’t notice a sign n 在校从四楼仍纸飞机的检讨500字5月12号要 英语课玩纸飞机检讨书 如图,在正方形ABCD中,E是CD的中点,F是AD的中点,连结BE、CF,且BE与Cf相交于点P,求证：AP＝AB.图： 对于英语听力不咋的我,是把--大学英语课本--做为-精听,还是(VOA-慢速)做为-"精听"对象? 英语听力很差,该怎么提高?在网上看到有说可以精听VOA,但是一点效果也没有.我的听力非常的差劲：考英语六级,我的阅读考了二百多分,但是我的听力只考了七十多分,(>__ 看看这篇短文改错I joined in Bird Watching class trip last weekend. I thought it would include a nice place to rest, for I was wrong. The climb burn my legs, and my legs ached. P.E. was easily compared to this. But when we reached on the top, 短文改错.Mr Black is one of my best teacher.He taught 1 our English when we were in No.1 Middle School.2 He was old,but he taught very good.He could make 3 his classes lovely.Mr Black got ready for his 4 lessons and was strict for us,too.Whenever 急,短文改错,麻烦找原文I was recently told that listening to loud music is gradually make people lose hearing i an sure it has turned a dead ear to my requests to turn her radio downWhen she gave a party she does have to invite the rest of t 幸福是什么?幸福就是一句祝福的话,一个理解的眼神,_____________.仿写句子 直径10CM的丹桂 价格多少? 第5题请回答 第五题! 求各种语言的“生日快乐”的表达 初二一元二次方程求解已知A是方程X^2-3X+1=0的根,求2A^2-5A-2+3/(A^2+1)的值 线性代数,如图B,D选项求给出反例! m取何值时,方程X2-(2m+2)x+m2+2=0(1)有两个不相等的实数根?　（2）没有实数根 f(x)=x^2-5x+3,证明f(A) =0 矩阵A=第一行2 -1,第二行-3 3 设2*2的矩阵A=【第一行1,-1,第二行2 ,3 】,f(x)=x^2-3x+3,求f(A)?求具体过程,尽量说清楚点哈!