请先将下式化简，再选择一个你喜欢又使原式有意义的数代入求值。-九年级数学

更多内容推荐

• 计算：-八年级数学
• 某服装厂准备加工300套演出服．在加工60套后，采用了新技术，使每天的工作效率是原来的2倍，结果共用9天完成任务．求该厂原来每天加工多少套演出服？-九年级数学
• 甲、乙两位采购员同去一家饲料公司购买两次饲料．两次饲料的价格略有变化，两位采购员的购货方式也不同，其中，甲每次购买1000千克，乙每次用去800元，而不管购买多少饲料．设-数学
• 计算：3yx2÷x3y-y2x3=______．-数学
• 计算或化简（1）（x+2x-2+4x2-4x+4)÷xx-2；（2）x22-x+4x-2，其中x=3-2．-数学
• The houses for the low-income families_______ at present in our city will be completed next year。A．t
• _____ in her best skirt, the girl tried to make herself ____ at the party.A．Dressed; noticedB．Dressi
• The audience were ______ by his _______ performance on the stage. A．amazed; amazedB．amazed; amazing
• 一组学生乘汽车去春游，预计共需车费120元，后来人数增了，费用仍不变，这样每人少摊3元，原来这组学生的人数是多少？-八年级数学
• 为了营造人与自然和谐共处的生态环境，某市近年加快实施城乡绿化一体化工程，创建国家城市绿化一体化城市。某校甲、乙两班师生前往郊区参加植树活动。已知甲班每天比乙班少种-八年级数学
• 计算：，并指出x的取值范围。-九年级数学
• The 2012 Olympic Games ________ in London appealed to a lot of people across the world.A．held B．to h
• ________ with her work, she didn't even notice the heavy snowfall outside the window.A．Occupyin
• China added 50.9 million Internet users in 2012，________ the total to 564 million at the end of last
• 先化简，再求值：，其中a=，b=．-九年级数学
• (2013·高考山东卷)The room is empty except for a bookshelf ________ in one corner.A．standingB．to stand C．s
• 先化简，再求值．（1）x2-4x+42x-4•(x+2)，其中x=5．（2）(x+1+4x-3)÷x-1x2-3x，其中x=3+1．-数学
• _________ the exact departure time, he missed his train.A．Not be toldB．Having not been toldC．Not hav
• Last Christmas, The Washington Post published an essay _______ what kind of Christmas dolls are popu
• 已知=，求的值。-九年级数学
• 先化简，再求代数式2x+2x+2÷x2-1x+2的值，其中x=2+3tan30°．-数学
• Susan wanted to be independent of her parents. She tried ___________alone, but she didn’t like it an
• 用价值为100元的甲种涂料与价值为240元的乙种涂料配制成一种新型涂料，其每千克的售价比甲种涂料每千克的售价少3元，比乙种涂料每千克的售价多1元，求这种新型涂料每千克售价-八年级数学
• 2004年12月28日，我国第一条城际铁路-合宁铁路（合肥至南京）正式开工建设，建成后，合肥至南京的铁路运行里程将由目前的312km缩短至154km，设计时速是现行时速的2.5倍。旅客-八年级数学
• (2013·高考天津卷)In some languages,100 words make up half of all words ________ in daily conversations.A．
• 计算下列各题．（1）（2a-1b2）2•（-a2b3）•（3ab-2）3；（2）(xx-2-xx+2)÷4x2-x；（3）x2-1x2-2x+1+x2-2xx-2÷x；（4）a2+aa-1÷(a-aa
• Don't spend time beating on a wall, ________ to change it into a door.A．hopeB．hopingC．hopedD．to
• (2013·吉林一中二模)Programs，________to join the old and the young together, are growing in popularity all
• By the time I saw the job ________ in the newspaper，it was already too late.A．advertisedB．to be adve
• ________ her anger，Maria turned around and walked away from him.A．ControlledB．Being controlledC．To c
• Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food
• The deer was lucky that it just missed ____ .A．catchingB．to be caughtC．being caughtD．to catch-高三英语
• _______our English teacher,our English has been greatly improved.A．Thanks toB．Thank forC．But forD．Ex
• all his courage, he invited Celine to get off the train with him．A．To gatherB．GatheredC．Gathering D．
• 列方程解应用题：某一工程进行招标时，接到了甲、乙两个工程队的投标书，施工1天需付甲工程队工程款1.5万元，付乙工程队工程款1.1万元，工程领导小组根据甲、乙两队的投标书-八年级数学
• (2013·高考北京卷)Volunteering gives you a chance________lives，including your own.A．changeB．changingC．chan
• ________ the words，the daughter understood what her mother was trying to tell her.A．To be heardB．To
• 先化简，再求值：a+1a-1-aa2-2a+1÷1a，其中a=3．-数学
• _______ by the rise of house price, people in big cities live under great pressure.A．To be affected
• This basket he sent me yesterday _______ many kinds of fruits, _______ apples and pears.A．contained;
• What difficulty will you have ____ people when you stay in a foreign country?A．understandB．understan
• In order not to be disturbed, he spent two hours ____ in his study.A．lockingB．to lockC．lockedD．being
• 对于公式1f=1f1+1f2（f2≠f），若已知f，f2，则f1=______．-数学
• 2 The bell ________ the end of the period rang, interrupting our heated discussion.A indicating B in
• We are invited to a party _________in our club next Friday. A．to be heldB．heldC．being heldD．holding
• (2013·高考四川卷)________which university to attend，the girl asked her teacher for advice.A．Not knowingB．
• (2013·高考安徽卷)________ in the early 20th century，the school keeps on inspiring children’s love of art.
• 已知a、b满足a-b+ab=0，且ab≠0，则1a-1b的值是（）A．1B．-1C．1abD．b-aab-数学
• 已知x-2y=0，求（）·的值。-九年级数学
• 已知1a-1b=12，则aba-b的值是（）A．12B．-12C．2D．-2-数学