一元一次方程的定义

设十位数字为X,个位数为Y X-Y=3 4/7(10X+Y)=10Y+X 设十位为x,个位数字为 y,列方程组 x+y=6,10x+y+18=10y+x x=2,y=4 几何题求解.求∠P已知：WZ长度=XY长度,WXY弧=200°.求∠P 三角形ADE的顶点D在三角形ABC的BC边上,且 1.在三角形ABC中,AB=c,BC=a,CA=b,AD是角平分线,I是内心,则AI/ID等于 （）A.b+c/a B.a+b/c C.a/b+c D.b/a+c2.如图,已知三角形ABC中,AE:EB=1:3,BD:DC=2:1,AD与CE相交于点F,则EF/FC+AF/FD （）A.1/2 B.1 C.3/2 D.2 （ ）的话语 填词语 急求英语外研社版Module1 Travel的单词下册的 用单词的适当形式填空：Hobbies can help people _____（relax） after the daily work. 外研版高一必修一英语module1单词精解 初三下英语书外研版第2模块的单词要英标 中文 词性 请马上回答 求外语教育与研究出版社初中三年级上册英语module1单词表外语教研社的,新标准的 zoos are the only places that some kinds of animals live 小孩子该怎么记汉字 孩子怎么样快速记住汉字字形 怎样才能让小孩快速的记住字 怎么扭魔方 6个面! 已知菱形ABCD边长是6,E是AD边上一点,DE=3,连结BE交对角线AC于M,求MC：AM的值是（ ）.不用重心及相似原理. I think Hangzhou is a good place ------ 填 to live in 还是.I still remember the park ---- we first met .(填 that ,which ,where ,when )怎么区分这四个词.望高手速回. I miss the days ___ I spent with you during last summer.The answer is when or that?此处到底填哪个词啊? I will rember the day that I spent together with you.麻烦翻译一下.急.这里面有错的单词或者语法吗 It was __________ last week that I got into touch with him.until till not until by 选哪个 do you think your hometown is a good place for a young person to live给两句以上的英文的回答, No one can call back yesterday是什么意思如有能力,小弟还有几道题：When one is about to act,he must reason first. 选择：That unforgettable ball was the last happy moment____I enjoy myself.A.whenB.thatC.whichD.where no one can call back yesterday的意思 No one can caiI back yesterday_ 怎样才能把魔方扭回六面一色?魔方好难学啊,我才只会一面一层! Last Day, Last Night 歌词 call back是call you back 还是call back you 还有这句 i will call back after dinner 为什麼you被隐藏了 如果要加个you 加哪呢 也就是说 you加中间或後面有分别吗 call sb back（回电话）后加什么?call sb back后是加人还是加电话号码?求英语高手回答（最好有例子) 有一门都可以打出来，我觉的好可以多给分 ,要初一下学期的 the last