张桑公路有一隧道，由A队单独施工，预计200天贯通，为了公路早日通车，由A，B两队同时施工，结果120天就贯通了，试问：如果由B队单独施工，需要多少天才能贯通？-九年级数学

更多内容推荐

• Lionel Messi，________the record for the most goals in a calendar year，is considered the most talente
• 某市政府2007年准备投入一定资金加大对主城区的改造力度，但又不影响对教育及其他方面的投入。下面是市规划局等部门提供的信息：①2007年用于主城区改造的资金不超过2007年教育-八年级数学
• 我县从今年1月1日起调整水价，每立方米水费上涨。据了解，实验中学去年11月份的水费是1800元，而今年2月份的水费是3600元。如果我校今年2月份的用水量比去年11月份的用水量多-八年级数学
• Yesterday a street­beggar bought a lottery ticket purposelessly，________him a millionaire overni
• 为加快西部大开发，某自治区决定新修一条公路，甲，乙两工程队承包此项工程．如果甲工程队单独施工，则刚好如期完成；如果乙工程队单独施工就要超过6个月才能完成，现在甲，乙-八年级数学
• He made up his mind to devote his life ______ the river ______ polluted.A．to prevent; to beB．to pre
• 已知：x=1-2，y=1+2，求(1x+y+1x-y)÷2xx2-2xy+y2的值．-数学
• （1）先化简，再求值：a-ba+2b÷a2-b2a2+4ab+4b2-1，其中，a=3+5，b=3-5；（2）解方程：x2-6x+3=0．-数学
• It was __________ computer games that cost the young man a lot of precious time that heshould ______
• 今年入夏以来，河北部分地区旱情严重，为了缓解甲、乙两地旱情，某水库计划向甲、乙两地送水。甲地需水量为180万立方米，乙地需水量为120万立方米，现已两次送水：往甲地送水-八年级数学
• ________ in the early 20th century，the school keeps on inspiring children’s love of art. (2013·安徽，32
• 在“5.12”汶川大地震的“抗震救灾”中，某部队接受了抢修映秀到汶川的“213”国道的任务．需要整修的路段长为4800m，为了加快抢修进度，获得抢救伤员的时间，该部队实际工作效率比-八年级数学
• 某商场计划购进一批甲、乙两种玩具，已知一件甲种玩具的进价与一件乙种玩具的进价的和为40元，用90元购进甲种玩具的件数与用150元购进乙种玩具的件数相同。（1）求每件甲种、乙-九年级数学
• Only when _______ according to the directions strictly will the medicine work well.A．takingB．to take
• Fortunately, people they met in the remote village were quite easy.A．to be got along withB．to get al
• Now that we’ve discussed our problem，are people happy with the decisions ________？A．takingB．takeC．ta
• He hurried to the station，only ________ that the train had left.A．to findB．findingC．foundD．to be fou
• 已知关于x的方程x2-2（k+1）x+k2+2k-1=0①（1）试判断方程①的根的情况；（2）如果a是关于y的方程y2-（x1+x2-2k）y+（x1-k）（x2-k）=0②的根，其中x1，x2为方程
• （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
• Here are some of the suggestions you need __________your hair.A．taking care of B．to be taken of C．to
• 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