设行列式A=第一行：3040第二行：2222第三行：0-700第四行：53-22,则第四行各元素的代

1.一项工程,甲队单独做要10天完成.乙队单独需要做20天完成,两队同时工作3后,乙队用新技术,工作效率提高了,25%,自乙队采用了新技术后,两队还需要同时工作,对少天完成工程?（结果保留一位 1.X/0.7--（0.17--0.2X）/0.03=1 求X是什么.中文版：（零点七分之X--零点零三分之零点一七--零点零二X=一）2.今年,小李的年龄是他爷爷的年龄的1/5,小李发现12年后,他的年龄变成爷爷年龄的1/3.求出 用因式分解法解方程（要过程）（1）x²-3x=0 （2）x²-3x=-2（3）x²-2x-8=0 （4）（x+4）²=5（x+4） 怎样用因式分解法解方程,5000(1-x)^2=3000 用因式分解法解方程（要过程、答案）：3x(x-1)=2(x-1) 因式分解法解方程,请写出过程,因式分解法：3x^2-12x=-124x^2-144=03x(x-1)=2(x-1)(2x-1)^2=(3-x)^2 John has really got the job because he showed me the official letter (offering)him it 为才能用ing? John has really got the job because he showed me the official letter ______him it John has really got the job because he showed me the official letter_______him it.A.offered B.offering 选什么?为什么? Are you going to stay up to do the job?Not___it is really necessary A,unless B,if C,because D,since what kind of job will have the opportunity to travel all over the worldExcept in tour area. 1.I'll____ if I have to spend another day in that place.Which of the following is not right.A.be made mad B.be forced mad C.go mad D.be driven mad 为什么其他选项不行?2.If their marketing plans succeed ,they will increase their sales____20 pe 1.Mery,_____ here—everybody elas ,stay where you are.A.come B.comes C.to come D.coming2.She run in the direction ______ she had come.A.of which B.by which C.in which D.from which3.I need to buy a new car and a house badly but I can't afford_____.A. 英语中关系There be sb do/doing sth 的 there was a wallet ___onthe floor .He picked it up and handed it to the police A.lie B lay c lyingD lied 什么时候该用哪个 ing/原形 像这种不知道该如何区分该怎么办啊 新年收获 作文 不少于100字 急!要快 【英语、语法问题】there be sth 后是doing 还是to do?、、、 那如果是there be sb后是doing 还是to do?那为什么 there be nothing left 是正确的? 直线y=-x+2关于x轴对称的直线的关系式是 关于直线y=x-2他关于x轴对称后的直线关系是为 求与直线 y=（3/4）x-1 关于x轴对称的直线的解析式,关于y轴对称的直线的解析式 It‘s very interesting for him to collect stampts.同义句转换 ＿ ＿ very ＿ ＿ collecting stamps.1 It‘s very interesting for him to collect stampts.同义句转换＿ ＿ very ＿ ＿ collecting stamps.2 The first Jews were welcomed by the I like the film very much and it's very interesting,"Betty said.（变为同义句） Betty said __________ the film very much,and _____ it _____ very interesting.请解释第三个空. Teahouse by Lao She is very famous and it's also very interesting.(改为同义句) It must be very interesting（改为同义句）It ______ _________ _________. interesting ,a ,it‘s,very,email 关于文明的作文要生活中的例子650字 作文：我与老师的故事,600字左右,要有事例,不要太假, 已知A(-2,1)与B点关于直线X=1成轴对称,则点B的坐标是?题目有点看不懂 高一英语的一个小问题.怎么样看出that引导的是一个什么从句? 已知点A为（-2,1）与B关于直线X=1成轴对称,则点B的坐标是? 1.prove什么情况下有被动?什么情况下没有?2.little、bit、a litter、a bit、not a litter、not a bit搞不清楚,帮我整理一下. 若点A(x,1)与点B(2,y)关于x轴对称,下列各点在直线AB上的是 A（2,3）B（1,根2）C（3,-1）D（-1,2）. 乃使其从者衣褐的 衣 的解释及词性活用