优化设计

因式分解 m²-n²-m-n=谢谢 (a+b)²-(m-n)² 因式分解 去括号与去分母应用题京津城际铁路于2008年8月1日开通运营，预计高速列车在北京天津间单程直达运行时间为半小时。某次试车时，实验列车由北京到天津的行驶时间比预计时间多用了6分钟 -1/2的1/3方乘3/2的负1/2方乘0.75的1/3方 一乘负一等于多少 【负2】乘【负2分之1】乘【负3】,等于几. (sinA)平方-3sinAcosA+4(cosA)4次方已知tanA=1/2,求(sinA)平方-3sinAcosA+4(cosA)4次方的值请求数学好的朋友教教我怎么解啊 sina的6次方＋cosa的6次方＋3×sina的二次方×cosa的二次方 ：∵一个数的平方根是a+1和2a-7 ∴a+1+2a-7=0 ∴3a=6 a=2 ∴这个数是：﹙a+1﹚²=﹙2﹢1﹚²=9,为什么要有这一步 ∴这个数是：﹙a+1﹚²=﹙2﹢1﹚²=9,能给我讲解下吗 -7²+2×(-3²)-(-6)÷(-1/3)² 人教版六年级上册英语书新版和旧版有什么不同 化简求值：已知x²-2x=2,求代数式（x-1)²+(x+3)(x-3)+(x-3)(x-1)的值 因式分解2x三次-6x+4 先化简代数式(x²-2x分之x+2-x-2分之1)÷x²-4分之2,并从-2≤x≤2中选一个你认为合适的整数x代入求值. 六年级上册英语书第二单元E部分是哪些内容 包括 序言 你们 英语题,答对加5分用括号内的字母组词,并用其适当的形式完成句子.Stop __________(r u e a g)! We will be late! _________(r h r y u) up! Her name is Kate.(改为否定句）Her name ____ ____Kate.“在我的班”用英语怎么说? 1.翻译词组收到.来信2.用词的适当形式填空She can see qver the wall because of her ________(high)3.句型转换I am keen on sports.(改为同一意思的句子)I ________ _________ __________ sports.Simon enjoy playing rugby and badmint 每答对一题加5分.根据句意和所给的首字母写出所缺单词The old man is very rich.He o______ many supermarkets and factories.The girl often borrows books and m_____ from the library.根据所给的汉语意思,用英语完成下列 a^4+a^3-a-1(因式分解) 因式分解：（a+1）^2-4(a+1)(a-1)+3(a-1)^2=_______拜托各位大神因式分解：（a+1）^2-4(a+1)(a-1)+3(a-1)^2=_______快快! 9.The charmer then held up both her hands,_____答案是D___.A.with her palm to be outwards and five fingers spreadB.palm was outwards and five fingers were spreadC.with palm outwards and five fingers spreadD.palm outwards and five fingers spread 因式分解:(a+1)(a+2)(a+3)(a+4)-120 题:1.Eddie lives not too far away form school .2.It takes her more than half an hour to go to school .3.I often go to school on foot .4.Keep quiet,please!5.We are not allowed to speak Chinese in our Fnglish lessons .6.We must listen to our teachers. 英语解释句子,1.what an interesting story this is!2.let's sing English song,shall we?不是翻译意思，是用英文解释这两句英文。晕吖.... 用英语解释句子、题目如下we showed her some pictures.In the end,he told me the truth. 三道英语的解释句子题1.Why don't you go there by plane?______ _______go there by plane?______ _______going there by plane?（2种）2.These days,you can shop for much French food in large cities in China.These days,you can_____ much French f [急~]一.用英语解释句子 1.What was the weather like the day before yesterday?2.He found it very difficult to sleep. 计算；（-125）*（-25）*（-5）*2*（-4）*8用有理数的乘法解答 很变态的,a^3-1,和a^5+a^4-a^3-a^2两题, -8减去正3 等于多少 因式分解(x+2y)(x-2y)-x+2y