秋天的声音有哪些

解比例.49:（10-x）=14:2 49+14%X=44%X+22,这个方程怎么解.要正确哦、谢谢、 7(x-2)=49方程怎么解? 若角a与角b的终边关于y轴对称,则角a与角b的关系 What to do next?Empty all the rooms before the building________A:is pulled down B:pulls down C:will be pulled down_______ all the stamps he is collected ,the dragon one is _____A:Of ,the most expensiveB:Of ,more expensiveC; In ,the most expensive 角a和b的终边关于y轴对称,就有角a+b=180°? 怎么会 The number of her ______(flight) out of beijing is No.HU 7382.They lived in London in ______(recently) years.He _______(invite) you to his birthday party tomorrow.Many people in different countries are _____ the UFOs.A\learning B\studying C\intereste 角α终边上的点P与点A(a,b)(ab≠0)关于x轴对称,角β终边上的点Q与点A关于y=x对称,求sinαsecβ+taαncotβ+secαcscβ的值 (X+X-0.1+9.1)/3=8.6怎么解 解比例,0.6分之3.2=X分之8 若角α与β的终边关于y轴对称,求出角α与β的关系. 若角α的终边与角β的终边关于y轴对称,则一定成立的是A.sinα-sinβ=0 B.sinα+sinβ=0 C.cosα-cosβ=0 D.cosα+cosβ=0请帮我解释一下D为什么是错的, 若α角与角β的终边关于Y轴对称,则α与β的关系是 求高手解答现在完成时练习2.用since和for填空1) ______ two years 2) _______ two years ago 3) _______ last month4) ______ 1999 5) _______ yesterday 6) _______ 4 o’clock7) ______ 4 hours 8) _______ an hour ago 9)______we were children 10 现在完成时和现在完成进行时练习求答案 cos(540-α)sin(α-360)/sin(-α+180)cos(180+α) 化简sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α) 已知函数f(x)=绝对值x-1,g(x)=-的绝对值x+3在加a,(a属于R).(1)解关于x的不等式g(x)6 求Bruno mars 的the lazy song 这段歌词的手机铃声ooooh yes I said itI said itI said cause I cantoday I don't feel like doing anythingI just want to lay in my beddon't feel like picking up the phoneso leave a message at the tonecause I swear 现在完成时的题I have already finished my homework.have这里没有意思么?完成时不是翻译为已经么?两个已经?I have a pen .是我有一支笔吗?哪我已经有了一支笔要怎么表达? 现在完成时~题1.Mr.Green ___ England.He ___ London for two weeks.A.has been to,will be to B.has gone to,will be in C.has been to,will be in D.has gone to,will be to2.Maria’s learned about 1000 Chinese words in our school,___?A.isn’t she B.do 现在完成时练习题选用have,has填空I______told him the news.she_______come back from school.You _______won the game按要求改写下列各句they have bought a computer.改成否定句He has lost his book.现改成一般疑问句,再做肯 现在完成时练习题 一、单项选择 1.Li Hong has ________ the army for 2 years.A.joined B.be in C.been in D.joined in 2.We have been friends since ______.A.children B.five years C.five years ago D.five years before 3.Mike ___________ the sto 0.25x(4+0.4)+9怎么简算? 已知函数f（x）=（x^2+c）/（ax+b）为奇函数,f(1) 已知函数f(x)=(ax-1)/(x+b),如果不等式f(x)>0的解集是(1,3)已知函数f(x)=(ax-1)/(x+b),如果不等式f(x)>0的解集是1老师抄的题。我也不是很清楚。 现在完成时练习题1.用have（has）been或 gone填空.A：Where _____Li Fei______?B:He_______to Hainan Island.A:How long ______he ______there?B:He ______there for three days?A:When will he come back,do you know?B:I'm afraid he won't come back 现在完成时 练习题 求高手完成下面关于现在完成时的练习1 I have_____met him before, so I have no idea about him.2 Jack has______ finished his homework.3 Mr. Wang has_____tanght in this school for many years 4 "Have you______seen the film?" x^2+（a-6)+9-3a=0和x^2-(a^2+a)x+a^3=0怎么解? a是什么实数时,方程1-3a-x/3=0的解在0与6之间(不含0和6) love song 中文歌词就是那种像：“嘿努你K不呆弄奈 嘿努你米搜呆弄奈 嘿努你沟你巧楼没流哇 不里叶撒拉球不K”这种的,可以根据这唱出来的.