机械电子工程

Most students watch TV every day.(改为否定句) Do you want to visit the farm with me?（改为同义句）( )you( )to visit the farm with me? do you want to visit the farm with me 同义句 氧化铁到底会不会和氧气反应?生成四氧化三铁吗?四氧化三铁的热稳定性是不是特别好?它们间怎么互相转化 （2X-1）2=（X+2)2 括号外面是平方2 (2x-1+x+2)(2x-1-x-2)=0(3x+1)(x-3)=0就这里不清楚 顺其自然是什么意思 连词成句.1.try,they,their,to,do,something,best,important(.) 1.I really don't know what I should say to do.为什么是say [to] do2.He is upsed and doesn't know what to do.为什么是what [to] do3.I don't want to surprise him.既然surprise 是动词,那何来a surprise party 之说4.be scared of 5.He tells m 单项填空5.-Why do you know Mount Huang so well?-Because I____there with my friends last week.A.wrote B.shopped C.toured D.watched8.The teacher often tells us not to_____all our spare time____video games.A.spend;on B.spend;in C.take;on D.take;in9. them they their的用法举例说明 一.根据要求或根据首字母填空.1.I w______ you not to watch TV every day.2.Come here,please,Don't ____(come的反义词) there.3.The book is over ____(here的反义词).二.根据要求转换句子,1.He ie the tallest in his class.(改为 任意写出两个非零的有理数,然后用第二个数除以第一个数,所得的商作为第三个数；再用第三个数除以第二个数,所得商作为第四个数；再用第四个数除以第三个数,所得的商作为第四个数.以 曹操是在什么情况下写的龟虽寿要详细点 好的我会追加分的 1.You seem to like sweetsA So did I B So I did应选什么?选A翻译成什么?选B呢?2.Both of us （have been /were）here last Sunday应该选什么?为什么不应该选另一个?3.There are some children who are playing football on the playgrou I eat only a little food.only应该放在实义动词前,助动词后.那为什么这里的only放在实义动词后? 1.Lucy将星期五后回来.Lucy will _____ _____ ______ Friday.2.如果有更多的树,我们的城市的空气将变得清新的多.If there _____ _____ _____,the air in our city will be ____ ____. 应用题.要方程解,甲骑自行车从a地到b地,乙骑自行车从b地到a地,两人都均速前进.已知两人在上午8时同时出发,到上午10时,两人还相距36千米,到中午12时,两人又相距36千米.求A、b两地间的距离. 已知0°A.30° B.15° C.不存在 D. 含羞草 说明作文快,急需一篇四年级含羞草的说明文.十万火急,大约400左右 As for homework,most students do homework every day.翻译 a＾2+b＾2+c＾2>=ab+bc+ca怎么证明！ 设实数a,b,c满足a+b+c=0,ab+bc+ca=-1/2,求a^2+b^2+c^2 1=(a＋b＋c) =a ＋b ＋c ＋2(ab＋bc＋ca),又ab＋bc＋ca≤(a ＋b )/2＋(b ＋c )/2＋(c ＋a )/2=a ＋b1=(a＋b＋c) =a ＋b ＋c ＋2(ab＋bc＋ca),又ab＋bc＋ca≤(a ＋b )/2＋(b ＋c )/2＋(c ＋a )/2=a ＋b ＋c ,即有1≤3(a ＋b ＋c Tom _____(hurry) off when he answered a telephone call.Danny prefers____（ride）a bike to talking a bus. 曹操的《龟虽寿》是一句.,. cos(arcsin3/5+arcsin8/17) 求值 式子a/bc+b/ca+c/ab的值能否为0为什么快第2题 式子a-b/(b-c)(c-a)+b-c/(c-a)(a-b)+c-a/(a-b)(b-c）的值能否为0为什么 cos(arcsin8/17) = ? 式子bc分之a+ca分之b+ab分之c的值能否得0,为什么? 式子bc/a+ca/b+ab/c的值能否为零 为什么kuai式子（b-c)(c-a)/a-b+(c-a)(a-b)/b-c+(a-b)(b-c)/c-a的值能否为0 为什么 已知a,b,c满足式子a/|a|+b/|b|+c/|c|=1,求式子(abc/|abc|)/[(bc/|ab|)*(ac/|bc|)*(ab/|ca|)]的值. 式子a/bc+b/ca+c/ab的值能否为0?为什么?