先化简，再求值：(1-1a-1)÷a2-3a+2a2-a，其中a=2．-数学

更多内容推荐

• “thanks” is polite when someone has done you a favour, but saying it too often is quite another thin
• his European tour with a speech in Bruges, Belgium, President Xi says China and the EU can become t
• （1）计算：2+(2-1)0-(-12)-2（2）化简求值：(3x-1-x-1)÷x2-4x2-2x+1，其中x2-1=0．-数学
• 化简求值：(x+1x-1+1x2-2x+1)÷x2x-1，x=2+1．-数学
• 某工地调来144人参加挖土和运土，已知3人挖出的土1人恰好能全部运走．怎样调配劳动力才使挖出来的土能及时运走且不窝工（停工等待）．为解决此问题，可设派x人挖土，其他人运土．-八年级数学
• 某中学运动场塑胶场地的维修工程准备对外招标，现有A、B两个工程队竞标，竞标资料上显示：若由两队合作，6天可以完成，共需工程费用10200元；若单独完成此项工程，A队比B队少-九年级数学
• While watching television, .A．the doorbell rangB．the doorbell ringsC．we heard the doorbell ringD．we
• The Shanghai Center, to be environmentally friendly, will be completed this year. A．designed B．desig
• 两电阻R1、R2并联后的电阻为R，则R、R1、R2之间的关系式为已知求R2。-八年级数学
• 已知x2-3x+1=0，则x-1x=______．-数学
• 若x+y=1，且x≠0，则（x+2xy+y2x）÷x+yx的值为______．-数学
• Experts warn that medical waste from hospitals, ifproperly, may contribute to spreading diseases．A．n
• 先化简，再求值÷，其中x=2。-九年级数学
• 先化简，x2-2xx2-1÷（x-1-2x-1x+1），然后自选一个合适的x的值代入求值．-数学
• 已知x=2+1，求(x+1x2-x-xx2-2x+1)÷1x的值．-数学
• 先化简，再求值：a+bab÷(ab-ba)；其中a=13，b=12．-数学
• by the thunder, the little girl dare not sleep in her bedroom.A．FrightenedB．FrighteningC．Having frig
• to her growing business, Mary has little time to take care of her family.A．DevotingB．To devoteC．Devo
• When the fire broke out in the shop, people ran for the exists, in fear.A．screamed B．screamC．screami
• 计算：(a-aba-b)÷a2a-b．-数学
• We had no one ________ us, for we could deal with the case all by ourselves.A．help B．to helpC．helped
• Launched in March 2010, China Face has been a daily news feature ________ on a Chinese individual.A．
• 一项工程要在限期内完成，如果第一组单独做，恰好按规定日期完成，如果第二组单独做，超过规定日期4天才能完成，如果两组合做3天后剩下的工程由第二组单独做，正好在规定日期-八年级数学
• 先化简，再求值：(3x-1-x-1)÷x2-4x+4x-1，其中x=-1．-数学
• 化简求值：(xx-2-x2+x)÷4x2-x，其中x=12．-数学
• The children all turned ________ the famous actress as she entered the classroom.A．looked atB．to loo
• 某服装厂准备加工400套运动装，在加工完160套后，采用了新技术，使得工作效率比原计划提高了20%，结果共用了18天完成任务，问计划每天加工服装多少套在这个问题中，设计划每-九年级数学
• The government plans to bring in new laws ________ parents to take more responsibility for the educa
• 某市今年起调整居民用水价格，每立方米水费上涨20%，小方家去年12月份的水费是26元，而今年5月份的水费是50元，已知小方家今年5月份的用水量比去年12月份多8立方米，设去年居-八年级数学
• We entered the café and sat down by the window, waiting ________.A．to serveB．to be servedC．servingD．
• Our director is out. I'll have her ________ you on the matter when she's back.A．to contact
• The old couple, ________ in the small village for years, can tell the names of all the villagers.A．
• 化简求值：(1a-2+a2-1a2+a-2)÷(aa+2)2，其中a=-1．-数学
• (2013·皖南八校二联)It is necessary that we keep the young generation ________ of the current affairs.A．inf
• —You were brave enough to raise objections at the meeting.--Well , now I regret ____that.A．to doB．to
• 甲，乙两组学生去距学校4.5km的敬老院打扫卫生，甲组学生步行出发半小时后，乙组学生骑自行车开始出发，结果两组学生同时到达敬老院，如果步行的速度是骑自行车的速度的，则-八年级数学
• 在实施“中小学生蛋奶工程”中，某配送公司按上级要求，每周向学校配送鸡蛋10000个，鸡蛋用甲、乙两种不同规格的包装箱进行包装，若单独使用甲型包装箱比单独使用乙型包装箱可-八年级数学
• The gas price keeps rising, ________ an average of 7.7 yuan per liter this month.A．hitB．to hitC．hit
• Curious and ________， I rushed out of my dormitory when I heard the noise of three gunshots.A．astoni
• People believe that the China Dream is not very difficult ________ so long as the whole nation works
• 某中学积极响应“钦州园林生活十年计划”的号召，组织团员植树300棵。实际参加植树的团员人数是原计划的1.5倍，这样，实际人均植树棵数比原计划的少2棵，求原计划参加植树的团-九年级数学
• (2011·湖南高考)Do you wake up every morning ________ energetic and ready to start a new day?A．feelB．to f
• To answer a telephone call, the careless woman went out of the kitchen, ________ the soup ________
• These diagrams are especially helpful when we have a concrete problem ________ at hand.A．be solvedB．
• ________ the right kind of training，these teenage soccer players may one day grow the international
• 某单位向一所希望小学赠送1080件文具，现用A、B两种不同的包装箱进行包装，已知每个B型包装箱比A型包装箱多装15件文具，单独使用B型包装箱比单独使用A型包装箱可少用12个。设-九年级数学
• 已知a=1a，求a2-a-6a-3÷a+3a2+a-6的值．-数学
• ______all the homework assigned by the school the students have to work at it till midnightA．Comple
• 当a=4，b=6，c=-5时，12(a2-b)c的值为（）A．1B．-12C．2D．-1-数学
• (1+1x-2)÷x2-12x-4．-数学