化简：（x-yx2-2xy+y2-xy+y2x2-y2）•xyy-1．-数学

更多内容推荐

• 已知x=2，y=3，求(1x+1y)•2x+y的值．-数学
• Would you please ______ write on the textbooks?A．don'tB．not toC．notD．to not-英语
• The living room is clean and tidy, with a dining table already ______ for a meal to be cooked. A．hav
• Some students came to Xiushui No.1 Middle School this year, and left their parents, _____ to return
• He became inspired when he thought about helping ordinary people _________to cholera.A．exposeB．expos
• 先化简，再求值：1a+2-44-a2，其中a=4+3．-数学
• On world AIDS Day, the minister of Health Department demanded that the problems______paid special a
• The ______ look on his face suggests that his ______ report failed the test.A．disappointing; disappo
• John received an invitation to dinner, and with his work ______, he gladly accepted it.A．finishedB．f
• 计算（1a-a）÷（1-1a）的正确结果是（）A．a-1B．-a-1C．1-aD．a+1-数学
• 先化简，再求值：(a-1a+1+4aa2-1)÷1a-1，其中a=-3．-数学
• _________ the illegal mobile WAP sites worries many parents.A．The children’s surfing B．The children
• ______ from endless homework on weekends, the students now find their own activities, such as takin
• In Pakistan, marrying without parental approval can mean ____________ from one’s family.A．being comp
• Titannic 3D moved all audience to tears once again, _____our attention to Cameron’s films and the d
• 先化简，再求值：mm+3-6m2-9÷2m-3，其中m=-2．-数学
• 先化简，再求值：(ab-b2)÷a-bab，其中a=2，b=3．-数学
• 先化简，再求值：m2m-2+42-m，其中m=13-2．-数学
• 已知a2+2a-3=0，求代数式(a-2a2+2a-a-1a2+4a+4)÷a-4a+2的值．-数学
• 计算÷（a﹣）的正确结果是[]A．B．1C．D．﹣1-八年级数学
• Last Monday, I was asked to give the new students a test____ their English level.A．gradingB．to grade
• Misunderstandings _____ from lack of social communication, unless _____ with properly, may lead to
• People sell their products ____advertisement in the newspaper.A．by putting anB．to put anC．by putting
• Please tell me the way you thought of _______ to stop smoking.A．make up your mindB．to make up your m
• ___ to get a ticket for the 2006 FIFA World Cup, George has been standing in a queue for two days. A
• When ___ to danger and conflict, men tend to increase blood pressure, ___ nervous and anxious.A．expo
• 有这样一道题：“计算：x2-2x+1x2-1÷x-1x2+x-x的值，其中x=2007．”甲同学把“x=2007”错抄成“x=2070”，但他的计算结果也是正确的．你说这是怎么回事？-数学
• 先化简，再选择一个合适的数代入求值：(1-1x+2)÷x2+2x+1x2-4．-数学
• 先化简，后求值：(3xx-1-xx+1)•x2-1x，其中x=-2．-数学
• The convenient media give people the chance to have the information we look forward_____to them quic
• 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