若-4＜x＜1，分式x-2x+22x+2（）A．有极大值-1B．有极小值-1C．有极大值1D．有极小值1-数学

更多内容推荐

• 先化简：(3a+1-a+1)÷a2-4a+4a+1，并从0，-1，2中选一个合适的数作为a的值代入求值．-数学
• Barbara often makes a schedule to get herself ________ of what she is to do in the day.A．remindB．rem
• 计算：x2-2xx+1•(1+1x)．-数学
• -Come on, please give me some ideas aboutthe design.A．fillingB．filledC．to fillD．being filled-高三英语
• ________ by a college or university in the USA Chinese students must have excellent speaking and wri
• His daughter has ___________ the young politician for five years.A．been married toB．been married wit
• 已知x=4-3，求x4-6x3-2x2+18x+23x2-8x+15的值．-数学
• Outside the exit, many fans waited for the great pop singer, _______to take a picture with him.A．hop
• Under the environment of fierce competition, the only way John could imagine____stress was to get to
• ---“The last one ____ will pay for the meal.” ---“Agreed!”A．to arriveB．arrivedC．arriving D．arrives-高
• I don’t think it easy, even if we work hard, ______ the South Korea and the North Korea to sit down
• --Why did you come a long way round?---I was afraid ___ near the fierce dog because I was afraid ___
• Although ________ the 2012 Nobel Prize in Literature, Chinese writerMo Yan does not consider himself
• 先化简，再求值：(x-xx+1)÷(1+1x2-1)，其中x=2cos45°+2cos60°．-数学
• _________, the experiment is sure to succeed.A．If carefully doingB．If carefully doneC．If it done car
• 先化简，再求值：（1a-1-1a+1）•a2-1a，其中a=2．-数学
• We advised him __________________A．telling not the news to his deskmateB．not tell the news to his de
• Every minute is made full _________ of ________ our lessons well.A．use; studyingB．usage; studyingC．u
• Mr. Green stood up in defence of the 16-year-old boy, saying that he was not the one________ . A．bl
• The music sounded cheerful and encouraging, all the people present in high spirits.A．makingB．to make
• Tick bites（蜱虫叮咬）are reported _______ in 12 provinces and claimed 31 lives since 2007.A．to break outB
• 化简求值：x2-1x2-2x+1+x2-2xx-2÷x，其中x=2sin45°-1．-数学
• 计算：(x+2x-x-1x-2)÷x-4x．-数学
• 晓晓根据下表，作了三个推测：x110100100010000…3-x-1x32.12.012.0012.0001…①3-x-1x（x＞0）的值随着x的增大越来越小；②3-x-1x（x＞0）的值有可能等
• _______ from father to son, the music has not changed for centuries.A．PassingB．To passC．Having passe
• 先化简，再求值：(11-x-1)(1x2-1)，其中x=2-1．-数学
• ________from space, the earth, with water_____seventy percent of its percentage, looks like a “blue
• _________to train his daughter in computer, he put an ad like this in the paper, “_________, a compu
• 化简：（x-yx2-2xy+y2-xy+y2x2-y2）•xyy-1．-数学
• 已知m=15+2，先化简再求值：m2m-2+8+4m4-m2．-数学
• 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