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已知3的X+2的平方*5的X+2的平方=15的3X-4 1.The price of cell phones _____ recently .A have risen B has been raised C has raised D has lifted2.The next plane ______ is from England.A arriving B to arrive C reaching D to reach3.I'd like to know if it will ______ if I park my car here.A mind B 请教几道初中英语题.要详细解释谢谢!1、 ? the shop ? in the morning? A.Is ,close B.Does , opened C.Does ,closed D.Is ,open 2、 ? begin at 8:00. A.The class B. A class C.Class D. Classes 1：Class3 won the football match!____it be ture?a;May b;Must C;Will D;Can2：____ I have your name?Yes,Smith.S-M-I-T-Ha:must b:may c:will d:need3:Will you ____ finish your homework before 8 o'clock this evening?a:can b:may c:be able to d:able to4:Ei 1.I will wait for Tim ___ he gets back.(答案是as,为什么till不行)A.that B.asC.till D.when2.Although it was so cold ,___ he went out without an overcoat.（答案是C,为毛啊）A.but B.soC.yet D.and3.He's already back to Australia,____?（答 1、How has it been ______there in the last five years?a.working on b.going on c.depending on 2.The fighting_______for a week.a.going on b.continued c,away from 3.He is not from the south._______am I.我觉得是so可答案是nor,为什么? 三角形ABC的三边a,b,c的倒数成等差数列,求证B>π/2度 三角形ABC的三边a,b,c的倒数成等差数列,求证B 在三角形ABC中,角A,角B,∠C的对边分别为a,b,c,若a,b,c三边的倒数成等差数列,求证,∠B 方框方框圆圈+圆圈方框圆圈=1三角形70(相同的图形表示相同的数字) 三角形＝圆＋圆＋圆,三角形＋圆形＝40,圆＝?,三角形＝? x-1分之2+ 2+3x分之1=3x平方-x-2分之3的解 三角形ABC的三边长abc的倒数成等差数列求证B 翻译 1)He exercised until his body cried for a rest.2)Don't let the high prices keep you from starting a collection of your own.为什么是let us not play 而不是let us don't play _____exciting news you've given us!A.What B.What an C.What a D.HOW答案上是A,但为什么不是B呢,I always get up late ______Sunday mornings.A.in B.on C.at D.from.这里答案上是B,不是说有日期才用on吗.为什么直接就用On了. 1/2+1/4+1/8+1/16+1/32的简便算法. △ABC的三边a b c的倒数成等差数列,求证B＜π/2.用反证法证明 什么是通货比/平方根法则/货币乘数 吸引金钱法则是什么? 货币时间价值公式怎么记?老是混掉,感觉都没不是很清楚公式的内在意思,有什么规律可以帮助记忆吗? 如图,三角形ABC的三个顶点都在圆O上,且AB=AC=13,BC=24,求圆的半径 24个圆圈和1个三角形的图形,不经三角形连接所有圆圈,不可用斜线圆 圆 圆 圆 圆圆 圆 圆 圆 圆圆 圆 圆 圆 圆圆 圆 圆 圆 三圆 圆 圆 圆 圆圆就是圆形,三就是三角形,不经过三角形将所有圆形 下图中三角形的面积是24平方米,求圆的面积(图中正方形的面积等于圆的半径的平方) 用适当的介词填空1.What time is it _____ your watch?2.Pick some flowers ____ the garden.3.He was ill ____ drinking too much.4.The place is famous ___ its hot spring. ①It （）that Tom got the first prize.A.to say B.said C.is said D.to say②he left his hometown two years ago（同义句）It has （）two years （）he left his hometown.③I heard him read English aloud in the garden.（改为被动语态）H 三角形ABC的三边长a.b.c的倒数成等差数列,求证：∠B＜90º 三角形ABC三边长a,b,c,的倒数成等差数列,求证：角B小于90° 三角形ABC三边长a,b,c的 倒数 成等差数列,证角B What if he ____to return me the money A.forgets B.forgot C.forget they ____ Linda to have a good journey.A.hope B.want C.wish Tina Lin was not like many of her classmates.She didn’t listen to popular music.She didn’t watch many movies,and she was 已知a+b+c=1,a^3+b^3+c^3=55,求(a-1)(b-1)(c-1)的值. 投资乘数,转移支付乘数,政府购买乘数,税收乘数之间的大小比较 投资乘数、税收乘数、政府购买乘数的含义和公式是什么?希望写明各个函数的含义,并伴有公式推导过程以及字母的含义,另外宏观经济学中好像还有几个比较重要的函数,希望一并告知.越详