计算a-1a÷（a-1a）的正确结果是（）A．1a+1B．1C．1a-1D．-1-数学

更多内容推荐

• ---It is said that China will declare war on Japan soon. ---______, China will never be the first c
• 已知1x-1y=3，则2x-2y+xyx-2xy-y的值为______．-数学
• When first ______ to the market, these new products in their company enjoyed a great success.A．Intro
• ______ to as much English as possible is a good way to learn English well.A．ExposedB．Being exposedC．
• 求值：（1）1+xx2+x-2÷x2-1x+2，其中x=12；（2）y3-y(xy+1)2-(x+y)2÷(x+y)yx+1，其中x=-11，y=112．-数学
• 化简：a2-1a2+6a+9÷(a+1)×a2-9a-1．-数学
• 将分式化简得，则x应满足的条件是（）。-八年级数学
• Tom was the first ________ he was wrong.A．admitB．to admitC．of admittingD．for admitting[-高一英语
• Jack became seriously ill after ________ in polluted air for many years.A．breathedB．breathC．breathin
• 课堂上，朱老师出了这样一道题：“已知，求代数式（1+）÷的值．”那么代数式的值是（）．-八年级数学
• 化简的结果为[]A.B.C.D.-b-九年级数学
• —What’s made Mr. Grey so sad?—_____ three tickets to the pop art exhibition.A．LosingB．LostC．Because
• Alice kept quiet about the incident _______lose her job. ( )A．so not as toB．so as not toC．so as to n
• 先化简，再求值：(1x+1-1x-1)÷1x2+x，其中x=5．-数学
• ____on the Yellow River, the town lies____ south of China.A．Locating; /B．Situated; /C．Situating; in
• 化简求值：(mm+3-2mm+3)÷mm2-9，其中m=3．-数学
• Mrs Smith hurried back home after work，only _________that the kitchen was a mess A．to findingB．found
• 先化简：1x2-x-x-2x2-2x+1÷x-2x-1，再从0，1，2，3中选取一个合适的数作为x的值代入求值．-数学
• 已知3x2+xy-2y2=0，求(x+yx-y+4xyy2-x2)÷x2+2xy-3y2x2-9y2的值．-数学
• 当a=1-2时，求a+1a-1-aa2-2a+1÷1a的值．-数学
• As we all know, diligence is the path ________to happiness. ( )A．ledB．leadsC．leadingD．having led-高一英
• I’d love to watch the specially dogs that can act as guides to the blind.A．trainingB．being trainedC．
• I still remember ______ to the south where we attempted _____ the river, which proved to be dangerou
• In order to by the education circle, he woks very hard.A．make himself recognizedB．make him recogniz
• 先化简，再求值：(1x-1+1x+1)•x-1x，其中x=-7．-数学
• ______ in the early 20th century, the school keeps on inspiring children’s love of art.A．FoundedB．To
• 某服装店有两种上衣售价均为a（a＞0）元，其中甲上衣的盈利b%（b＞0），乙上衣亏本b%．服装店老板说，他不赔也不赚，你认为这种说法正确吗？-数学
• The Chinese mainland has 157 billionaires as of 2013，_________second in the number of billionaires w
• I have learned a lot about Asian customs, ______ in the small village for three years in the early
• 计算：（1）x+2x2-6x+9÷13-x×x-3x+2（2）(x2-1x2-2x+1-x+1)÷xx-1．-数学
• 计算：(1+1a-1)÷a2a-2=______．-数学
• 计算：3-x2x-4÷(x+2-5x-2)=______．-数学
• 若1a-1b=2，那么a+3ab-ba-b的值为（）A．12B．-12C．52D．-52-数学
• Once you want to do something, you must get down _____it well. ( )A．doB．doingC．to doD． to doing-高一英语
• All kinds of promotion activities were launched,for the May Holiday Market. A．intendedB．intendingC．b
• Tom had no trouble at all the office building according to the note written by Mr. Smith.A．to findB．
• It is no use without taking any measures.A．cryB．cryingC．to cryD．cried-高一英语
• The little baby, if _________ by other people, will wake up and cry.A．disturbingB．disturbedC．to be
• 先化简，然后请你给a选取一个合适的值，再求此时原式的值.-八年级数学
• ______from the top of the mountain, the village looks like a small box.A．SeenB．Being seenC．To seeD．
• Many developed countries have agreed to help the less developed ones but it remains ________ whether
• ______to the sun for too long, I think, can hurt your skin.A．Being exposedB．To exposeC．ExposingD．Exp
• 计算：（1）a2+2a+1a2-a-a+1a-1；（2）(-a2b)2÷(-ab2)3•(1ab)4．-数学
• 在解题目：“当x=1949时，求代数式x2-4x+4x2-4÷x2-2xx+2-1x+1的值”时，聪聪认为x只要任取一个使原式有意义的值代入都有相同结果．你认为他说的有理吗？请说明理由．-数学
• ______ at my classmates’ face, I read the same excitement in their eyes.A．LookedB．LookC．To lookD．Loo
• 化简求值：(x2-16x2+8x+16+xx-4)÷1x2-16，其中x=2+1．-数学
• 请你先化简，再选取一个使原分式有意义，而你又喜欢的数代入求值：x3-x2x2-x．-数学
• 计算(1+1a)÷(1-1a)的结果为（）A．a+1a-1B．a-1a+1C．a2-1a2D．a2a2-1-数学
• Liu Yang became the first woman astronaut in China _____into space. ( )A．ravelB．travelledC．to travel
• The boy pretended when his parents entered the room.A．readingB．to readingC．to be readingD．having re