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A、B是两个自然数,A+B=19,且4/7 A、B是两个自然数,A+B=19,并且4/7 AB/A+B=19.A.B 为自然数且A>B.求A .B的值 you will feel better soon.l am sure that___ ___ you will feel better soon.The Greek army stood ouside___ ___the Greek armyHe didn't write poems any longerHe___ ___wrote poems都是保持句意不变 1They have fun (walk)in zhe park.2we all know Mr wang (arrive)next Sunday.Let us (mett)him at zhe airport3Please come over (visit)our school.there (be)many things to see4the girl enjoy （See） comedies5TAT is a small city.it has a busy street.(合 在三角形abc中,ad,ae分别是bc边上的中线和高,ae等于2cm,S三角形abd等于1.5cm平方,求bc和dc的长! 短文填空 That is a picture of a classroom.Tclassroom is big_1_ clean.You can see the teacher's desk,some desks and_2_ chairs in it.Look!Here are three books_3_ the teacher's desk.Asocer ball is_4_ it._5_the clock?Oh,it&# 负四分之一的2003次方乘上（—4）的2004次方的答案用初中的解法来做 负2的2003次方是多少（具体数） 因式分解3x^2+x-2没学十字相乘 已知：如图,AD为三角形ABC的中线,E为AC上的一点,连接BE交AD于F,且AE=FE,BF与AC相等吗?为什么? 如图 在三角形abc中,ad为中线,e为ac上一点,ad与be交与f,ae=af,求证ac=bf级别不够,不能发图片,你们自己画吧,不好意思啊尽快啊,28号前 1.Are you going to have a sports meeting tomorrow?Yes,but I will call Kate to make sure _____A.why to start B.when to start C.what starting 分子：1×2×3＋2×3×4＋3×6×9＋4×8×12＋……＋50×100×150分母是：分母是：2×3×4＋4×6×8＋6×9分母是：2×3×4＋4×6×8＋6×9×12＋……＋100×150×200商是多少? the members of the Red Cross were asked to stay ____ they were,and _____A.where...so they did B.in which...so they wereC.where.so were they D.in which...so did theyTom hadn't turned up,so a practical joke_____to us to punish him after his arrival.A.h 高度h/米 气温t/摄氏度 0 20 50 20-0.3 100 20-0.6 150 20-0.9 200 20-1.2（1）写出利用高度h表示气温t的代数式 单词拼写（用括号内所给单词的适当形式填空.）would you like ___(help) me ____(make) the model plane?she likes ____(make) kites.she also ____(fly) a lite at the weekend.some of the students ____(not like) ____(read) books.they are t 1.The student is sitting next to me is sick now2.I'm using the pen which be bought it yesterday3.I'm going to work in the hospital where needs me 4.I'd like to buy that new model recorder but which is too expensive for me5.Henan is a province which p 已知:△ABC和△ECD都是等腰直角三角形,且AC=BC=2,EC=CD=1(1)如图1,点E在AC边上,连BE并延长交点F,此时容易证明BF⊥AD（这里可以不证明）.试求AF的长(2)将图一中的△ECD绕点C逆时针旋转一锐角（如图2 已知如图三角形ABC和三角形ECD都是等腰直角三角形∠ACB=∠DCB=90度 D为AB边上一点求证BD=AE 如图,△ABC和△ECD都是等腰直角三角形,∠ACB=∠DCE=90°,D为AB边上一点,求证：（1）.△ACE≌△BCD,（2）,AD²+AE²=DE² 如图,三角形ABC和三角形ECD都是等腰直角三角形,∠ACB=∠DCE=90°,D为AB边上一点.（1) 求证：△ACE全等于△BCD；(2) 设AC和DE交于点M,若AD=6,BD=8,求ED与AM的长. 999+1等于多少 1加999等于几 1加999等于多少? 2的1次+2的2次.+2的999次等于? 如图,在三角形ABC中,AD垂直于BC于D,且AD^2=BD*DC,求证三角形ABC为直角三角形. 已知：如图在三角形ABC中,AD垂直BC,垂足点为D,AD²=BD·DC.求证△ABC为直角三角形.我们没学相似，麻烦用勾股定理证 已知,如图,在△ABC中,AD⊥BC,垂足为点D,AD的平方=BD×DC.求证：三角形ABC是直角三角形 因式分解(x^2+3x)^2-(2x+6)^2怎么做 因式分解（2X*X）+3X-2=?因式分解 的题 x^4-2x^3+x^2 (2)3x^6-3x^2 (3)x^2-4xy-1+4y^2 因式分解