先化简，后求值：(3xx-1-xx+1)•x2-1x，其中x=-2．-数学

更多内容推荐

• 已知y=x2+2x+1x2-1÷x+1x2-x-x+1，当x=2009时，求y的值．-数学
• 化简求值：a-ba+2b÷a2-b2a2+4ab+4b2-aa+b，其中a=2+1，b=1-2．-数学
• She let the children ______ to play instead of staying at home all the time.A．going outB．went outC．t
• ____ of their bad habits, the boys switched from being dependent on their parents to ____ for others
• The Diaoyu Islands have been part of China’s territory since ancient times, __________ as important
• 已知x2-5x-2009=0，则(x-2)3-(x-1)2+1x-2的值为（）A．2010B．2011C．2012D．2013-数学
• _____ by Japan's "purchase" of the Diaoyu Islands, China and Japan lose the opportun
• Jenny hopes that Mr. Smith will suggest a good way to have her written English ______ in a short per
• 化简：[(a+1)(a-2)a2-4a+4-aa2-2a]÷aa-2-数学
• 先化简再求值(1-2xx+y)÷x2-2xy+y23x+3y+x2+xyx2-xy，其中x=2+1，y=22．-数学
• 先化简：（mm+3-2mm-3）÷mm2-9，再选一个适合的m的值代入求值．-数学
• As a result of the serious flood, two-thirds of the buildings in the area .A．need to repairB．needs t
• China’s first aircraft carrier, ____ as long as 304 metres, was handed over to the People’s Liberati
• =（）-八年级数学
• 各分式，，的最简公分母是（）。-八年级数学
• Driving along the Congtai Road in the rush hour, you will surely get _______ in the traffic jam.A．st
• 已知x=3+1，求2xx2-1-1x+1的值．-数学
• This machine is very easy _______. Anybody can learn to use it in a few minutes. A．operating B．to be
• Many people prefer large cars, __________________large cars are safer than small ones. A．thinkingB．t
• The officer gave orders that anyone________ a gun should be reported to the police station.A．sees ta
• 先化简，再求值：1x+2-x2-4x+4x2-x÷(x+1-3x-1)，其中x满足x2+2x-4=0．-数学
• 先化简，再求值：2x2-1-1x-1+2x+1，其中x=2-1．-数学
• 已知a=2+2，求（3aa+1-aa-1）÷aa2-1的值．-数学
• Xiao Li is said _________ abroad, but I don’t know what country he studied in.A．to studyB．to be stud
• 当x=﹣时，则的值是（）。-八年级数学
• _______ in the leg made it impossible for him to walk to school every day.A．Being injuredB．InjuredC．
• On average, 50 percent of those _____ said they would prefer to see Mr. Obama win the 2012 ticket, _
• =（）。-九年级数学
• 化简：x-yx+3y÷x2-y2x2+6xy+9y2-2yx+y-数学
• The bridges over the Fuyang River have been rebuilt, _________ it possible for boats to sail.A．to ma
• 先化简，再求值：(1-3x+2)÷x2-2x+1x+2，其中x=2sin30°+tan60°．-数学
• 先将代数式(x-xx+1)÷(1+1x2-1)化简，再从选取一个你喜欢的整数x代入求值．-数学
• 请你先将式子2009aa2-2a+1÷(1+1a-1)化简，然后从0≤a≤3的范围中选择一个恰当的整数作为a的值代入其中求值．-数学
• 先化简，再求值：（x2+x-1x-1-1）÷xx2-1，其中x=2（结果保留根号）．-数学
• 化简，求值：m2-2m+1m2-1÷(m-1-m-1m+1)，其中m=3．-数学
• This year, Chinese readers are especially excited with the Nobel Literature Prize, for the first tim
• South Korean star PSY's “Gangnam style” video,________, has set the Guinness World Record for t
• It is hoped that this project _____ by the end of 2014 will be a popular tourist attraction of the c
• The airport ______ next year will help promote tourism in this area.A．having been completedB．complet
• Pressed from his parents, and _____ that he has wasted too much time, the boy is determined to stop
• A new virus related to SARS is reported______ at least one person in China last week.A．to kill B．to
• 先化简，再求值：，其中x=-1。-八年级数学
• 先化简2xx2-1÷(1-1x+1)，再代入一个你喜欢且使原式有意义的数求值．-数学
• 求值x-1x÷(x-1x)，其中x=2-1．-数学
• 计算：(2aa-1-aa+1)•a2-1a-数学
• 化简求值：当x=时，=（）。-八年级数学
• 化简，结果是[]A．B．C．D．-八年级数学
• 化简：=（）．-八年级数学
• 化简：（a2-4a2-4a+4+2-aa+2）÷aa-2，并选一个你喜欢的a的值代入使结果为整数．-数学
• ____ to complete the job on time, they set out to work immediately.A．Being determinedB．On having det