（1）请从三个代数式4x2-y2，2xy+y2，4x2+4xy+y2中，任选两个构造一个分式，并化简该分式；（2）解方程：（x-1）2+2x-3=0．-数学

更多内容推荐

• It was________that many people were injured in the accident.A．reportedB．to be reportedC．reportingD．r
• The traffic rule says young children under the age of four and ________ less than 40 pounds must be
• Nobody but doctors or nurses and those ________ by Dr Li ________ to enter the patient’s room.A．bein
• a college or university in the USA, Chinese and other international students must show and prove the
• If you’d like me to do the job for you, I want to ____________ in cash.A．get paidB．paidC．be payingD．
• Some students didn’t get a brief summary ________ in their essays.A．includeB．includedC．includingD．in
• 化简求值：（1）已知|a-1|=2，求a2-4a+4-4a2-4a+1的值；（2）先化简，再求值：x+1x2+x-2÷(x-2+3x+2)，其中x=3+2．-数学
• 某厂一个车间计划在一定时间内加工560个零件，在加工120个零件后，改进了操作技术，每天能多加工15个零件，结果比原计划提前3天完成任务。则改进操作技术后每天加工的零件个-八年级数学
• There is no doubt that our educational system leaves something __________. A．being desiredB．to be de
• The direct flight has proved successful，________ Taiwan another tourist destination for people on th
• 如果2a-b=0，那么a2-b2a2-2ab+b2的值是______．-数学
• When ________ about his school life, Tim thought it colorful.A．askedB．askingC．to askD．asks-高三英语
• Johnny wanted to ride his new bicycle in the street, but his mother told him ________.A．not toB．not
• He is said ________ college in America, studying music.A．to be attendingB．that attendC．to be attend
• In 2012 Mo Yan won the Nobel Prize for Literature, ________ a host of imitators.A．inspiringB．inspir
• He is afraid to face the difficulty he thinks he'll have ________ the driving test tomorrow; h
• The Diaoyu islands have been part of China's territory since ancient times, ________ as importa
• In order to jump, your body changes the chemical energy ________ in the food you have eaten into me
• When ______ help, one always says “Thank you” or “It’s very kind of you”A．offeringB．offeredC．to offe
• 先化简，后求值：x+1x+2÷x2-1x-1，其中x=3-2．-数学
• 化简后求值：已知a=2-2，b=2+2，求a3b+a2b2a2+2ab+b2÷a2-aba2-b2的值．-数学
• ________to get a seat for the concert，he didn’t mind standing in a queue all night.A．DetermineB．To b
• 武汉市某校组织甲、乙两班学生参加“美化校园”的义务劳动，若甲班做2小时，乙班做3小时则恰好完成全部工作的一半；若甲班先做2小时后另有任务，剩下工作由乙班单独完成，则乙-八年级数学
• This project requires close teamwork. _______Will be achieved unless we work well together.A．Nothing
• 若4x-3y=0（y≠0），则（x+y）：y=______．-数学
• Unless ________ to answer questions, the pupils won't talk in Mrs Smith's class.A．askingB
• ________ from the bright smile on his face, he ________ in passing the job interview.A．Judging; mus
• 先化简，再求值：x2-4x2+4x+4÷(x-2-2x-4x+2)，其中x=3．-数学
• 1m+1n=1m+n，则nm+mn的值为多少？-数学
• Either you or one of your students ________ to attend the meeting ________ tomorrow.A．are; to be hel
• With all the books he was interested in ________， he left the library and went back to his dorm.A．b
• . — Why was Professor Johnson unhappy those days? — The only reason was ________the theory he stick
• With the couple________in a nearby town，the house seems pretty empty most of the time.A．workB．to wor
• 小明家准备装修一套新住房，若甲、乙两个装饰公司，合做需6周完成，需工钱5.2万元；若甲公司单独做4周后，剩下的由乙公司来做，还需9周才能完成，需工钱4.8万元，若只选一-八年级数学
• 先将x2+3xx-1-(1x-1)化简，然后请自选你喜欢的一个适合的x值代入，再求原式的值．-数学
• As a considerate secretary, she never fails to know what ________ in her daily routine.A．to expect
• ________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.A．Hav
• 计算：(a+b-b2b-a)÷(a-a2a-b)．-数学
• 已知x-3y=0，求(2x+y)(x-y)x2-2xy+y2的值．-数学
• 已知a+b=3，ab=1，则ab+ba的值等于______．-数学
• 下列运算正确的是（）A．ca-c+1a=-1a\；B．12a+12b=12(a+b)C．ba+bc=2ba+cD．x2+y2z÷zx2+y2=x2+y2z2-数学
• ______more effectively with foreign firms, many Chinese firms have turned to new technology．A．Being
• I stopped the car________a short break as I was feeling tired. (2013·山东，29)A．takeB．takingC．to take D
• They suggested that the professor ________ just now ________ chairman of the meeting.A．referring to
• The old man sat in front of the radio every evening, ______ his favorite program.A．dying to hearB．wa
• 某校初三（2）班的师生到距离10千米的山区植树，出发1个半小时后，张锦同学骑自行车从学校按原路追赶队伍，结果他们同时到达植树地点，如果张锦同学骑车的速度比队伍步行的速度-八年级数学
• 若x2+2x-2=0，求代数式(x2x-1-2x1-x)÷2x-1-2的值．-数学
• —Can you introduce me a high quality machine?—My pleasure. ________ well even on wet roads, this kin
• No matter how frequently ________， the works of Beethoven still attract people all over the world.A
• 先化简，再求值：a2-b2a2-ab÷(a+2ab+b2a)，其中a=2，b=-3．-数学