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sinA/2 + cosA/2=2分之根号6A为锐角,求A的大小. 已知a属于（90,180）且sina/2+cosa/2=根号6/2,求cosa. 若SINA+COSA=2分之根号6,则SINA=啥 当x为任意实数时,下列分式一定有意义的是( )选DA、2/x B、2/x-1 C、2/x+1 D、2/x²+1【答案已给出,要过程知道怎么来的】 jill has to help his mother to do the housework at home .（对划线部分提问）help his mother to do the housework at home 是划线部分can jeff come to my birthday party?（作出否定答语）_________,__________ ________please give me a ca 如果分式1/x²-2x+m不论x取何实数总有意义,请写出m的范围. 当x取任意实数时,下列分式中一定有意义的是..A.2/x+3B.1/(x+1)的平方C.x+1/x的绝对值D,1-x/x的平方+1 单项选择tony is a funny boy.he always makes us________.A.laughing B.to laugh C.laugh D.laughed 无论x取任何实数,分式1/x²-4x+m都有意义,则m的取值范围是 1.He became a d_________,he lost his hearing.2.These are telephone numbers ____________(记下来)3.How do we _______(在生活中成功)4.I think you made a mistake in _____(pronounce)5.用方框中单词的适当形式填空,使短文完整safety; 若对于任何实数的X ,分式 1/x²+4x+C 总有意义,求C的取值范围 初一上册语文书上的100个成语人教版的 初一上册语文书上的100个成语的意思 你能告诉我他刚才说的话吗?翻译 几道六年纪的英语题 速速速速速速速速速根据首字母提示完成句子：1.We h_____________ a sports meeting every autumn.2.I'm very i_______________ in science.3.How much money did you s____________ on the house?4.He came late as 一道初中简单哒英语题··速速速速...what do you think of her speech?she___for one hour, but didn't ___much.A.told shoutB.shouted toldC.said speakD.spoke say一定要讲原因哦~~ 因式分解a²b²-4ab＋4 , 因式分解:a²b²+4-4ab 因式分解（a²-1）（b²-1）+4ab 谢各位师兄师姐~ （a-b）²+4ab因式分解 因式分解(a+b)²+4ab 跪求所有七年级下册语文书课文上的成语及其意思 下册上 有什么 成语 初一下册里有什么成语和历史有关 因式分解：（a²-1）(b²-1）+4ab.快点啊!在线等!快点啊! 因式分解：（a²-1）（b²-1）+4ab 一道数学简便计算题,数学大师进,数学高手进.2006×2008208-2008×20062005 急急急急急急急急急急急急急 1+1+3+3+5+5+.101+101=?如题 1+3+5+7.+101= 请随便 用英语怎么说汉英翻译 请随便 Please make youself _____ ______ 230+240+250+260+270怎样找规律 250+260+270+280+290的规律是什么