中国歼击机系列图片

（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? 为什么cos(arcsin8/17) = 15/17 sin（-4π/3）怎么算 提问sin(π/4-θ)=1/3,则sin(π/4+θ)= sinα+cosα=4/3,求sinα×cosα