说明道理的词语

在三角形ABC中,若2b=a+c,求证:2cos((A+C)/2)=cos((A-C)/2) 在三角形ABC中,若a^2=b(b+c), 求证A=2B 在三角形ABC中,a*cos平方C/2+c*cos平方A/2=3b/2,求证a+c =2b 在三角形ABC中,a^2=b(b+c),求证A=2B a white room 的意思 East Room of the White Dr.Chan emphasized the need for calm,but at times spoke as if a pandemic had already begun,saying,for instance,“W.H.O.will be tracking the pandemic.” 里面的saying什么意思?East Room of the White House是指什么? 用一句话概述百草园到三味书屋 the white room 歌词 I am concerned about U 和I have been concerned about U有什么区别.如题 ____,young man!If you're late for work again,you'll lose your job.A,Watch you stepB,Take it easy C,Use your head D,Have a look那个答案正确. work hard,or you will lose the job改为同义句——— ——— ——-work hard,you will lose the job纳谁好呢？ He was often late for work , and that finally his job. A cost B spent C took D lost本题选A 2012年五年级上册寒假生活中的who is right?mr black or mrs white?怎么回答? 过电压保护器和避雷器的区别?请问过电压保护器和避雷器有什么区别? They are proud that they can help____people.A.so many B.so mach C.too many D.too much(要原因） If you can talk the young man ____ learning the computer,he will do better in his job.A.ofB.intoC.aboutD.on为啥选B? The young man__a well-paid job in that big company, but, to our ,he refused itA.is offeredB.offeredC.has pfferedD.was offered 在1921年中国共产党诞生至1949年新中国成立以前的时期,中国存在的三种主要的政治力量包括哪些? 已知A（X1,-6）和B（2,Y2）两点：（1）当A、B关于X轴对称时,X1=___,Y2=____（2）当A、B关于Y轴对称时,X1=____,Y2=____（3）当A、B关于原点对称时,X1=___,Y2=____ Look _____ the picture.The boy is walking _____ the river.There is a house _____ the river.There are some trees ______ the house._____ the trees are many apples. 氧化锌避雷器与浪涌保护器的作用分别是什么 JLSP浪涌保护器的作用有哪些? 浪涌保护器是用来做什么的.在电路起什么作用的.他的工作原理是什么?具体是怎么在电路上工作的 ,怎么来选大小的? 控制器中的浪涌保护器有什么作用 中国的外交活动进入新中国成立以来最主动最有利最活跃的时期是 浪涌保护器在电路中起什么作用? 1.How ofthe do you help with housework?2.What do you usually do on weekends?3.How ofthe does your best friend exercise?4.What do you usually do after school?将上面句子翻译,翻译立刻采纳.顺便回答 esteem和respect的区别?请不要复制字典的内容! 请帮我翻译一下这个句子：it's amazing what you can do with a little help from your firends. esteem,respect 我区分不开! (仁爱版)邮发代号是多少? Examine the relations between the rule of law and the separation of powers? pls help me i no dont k其实我想要的文章大概300 个字以上的 然后要 说明他么的关系和互相的影响。。。。 thx and pls help me asap thx