已知a-b=3+2，b-c=3-2，求a2+b2+c2-ab-bc-ca的值．-数学

更多内容推荐

• 已知整数a，b满足a+b=1404，请写出两组符合题意的a，b的值．-数学
• Ladies and gentlemen, please fasten your seat belts. The plane.A．takes offB．is taking offC．has taken
• ―What about 10 o’clock tomorrow morning? ―I’m afraid I can’t make it. I _________ then.A．am going to
• Jack doesn’t smoke now, but he ______ for almost twenty years.A．smokedB．was smokingC．has smokedD．had
• —Tom, you didn’t come to the party last night?— I _____ , but I suddenly remembered I had homework t
• For some time, Chinese people, under the leadership of CPC, ________ the contents of the Scientific
• 计算：75+313-48．-数学
• （1）计算：27-28-613+18；（2）用配方法解方程：x2-2x-2=0．-数学
• His failure in the experiment suggested that he ________ his teacher’s proper instructions.A．should
• .Our team was ahead during the first half, but we _____ in the last ten minutes.A．were wonB．were los
• It is the first time that I ＿＿＿ this kind of moon cake. A．enjoyedB．have enjoyedC．enjoyD．enjoying-高一英
• Putting a candle in the window ___ a traditional practice in many cultures, ____ has a variety of me
• 化简：18-50+38．-数学
• First aid is a temporary form of helpto someone who suddenly falls ill or gets——before a doctor can
• In the past few years, sea ice ____ in the Arctic as a result of global warming.A．had meltedB．has be
• By the time our teacher arrives tomorrow, all the work _____,with which he will be content.A．is acco
• 计算：（1）（2）-八年级数学
• Instead of flocking into the cities, the peasants __________ villages and townships of a new type in
• Jack doesn’t smoke now, but he ______________ for almost twenty years.A．was smokingB．smokedC．has smo
• —Did you happen to hear the recent news? —Yes, Alice ____ the gold medal in the speech contest, whic
• 计算（1）22-123-2+3；（2）（46-38）÷22．-数学
• （1）计算：318+1550-412；（2）解方程：3x（x-1）=2x-2-数学
• The teacher told us that the sun ＿＿＿ in the east and ＿＿＿ in the west. A．raised; setB．rose; setC．rise
• I had been working on math for the whole afternoon and the numbersbefore my eyes.A．swimB．swumC．swamD
• ---- I ’m sure Andrew will win the first prize in the final. ---- I think so. Hefor it for months.A．
• The photome my childhood.A．remind;ofB．reminds;ofC．remind;forD．remind;to-高一英语
• 若a，b为有理数，且9+27+12=a+b3，则以a，b为两条直角边的直角三角形的斜边长c=______．-数学
• Mr. Smith was very disappointed to see the car he had had _____ went wrong again.A．to be repairedB．r
• x+xyxy+y+xy-yx-xy-数学
• ________ to the hospital, the badly injured woman was immediately operated on so that she could be s
• The hard life in the mountainous area he has adapted to ____ a real challenge to anyone. A．meanB．mea
• 计算：（1）28-18+12（2）tan60°+2sin45°-2cos30°-数学
• No decision _____ about any new operations until we have discussed all the details. A．is madeB．is b
• 20. He reads newspapers every day to keep himself_______about what's going on in the world.A．in
• —I phoned you at 7 yesterday evening but nobody answered.— Oh, I ______ my dog in the park then.A．wa
• 若a，b为有理实数且4-18+12=a+b2，则a+b=______．-数学
• Before joining the Department of Defense, Mr． Panetta _______ as director of the CIA from February 2
• —May I use your car this afternoon?—Sorry. It broke down this morning again. I’ll have it ________.A
• (23x9x+6xyx)-(x21x-yyx）．-数学
• By the end of this year, a new library ________ in our school.A would be completedB will have been c
• He said that he _______ to Shanghai the next day. A would go B went C had gone D would have gone -高三
• I will stay at home and read some books if it ________ tomorrow. A．rainB．will rainC．rainsD．is going
• With the fast development of computer and Internet technologies, traditional printed books ______ by
• Nowadays, we can obviously feel that the Net_______ our life rapidly. A．had changedB．changedC．is cha
• “Mom_______ the supermarket,” the daughter said to her father.A．has gone toB．has been toC．goes toD．g
• At this time tomorrow ______ over the Atlantic. A．we’re going to flyB．we’ll flyC．we’ll be flyingD．we
• （1）计算：22+32=______．（2）已知方程：x2-1=0，则x=______．-数学
• 计算20+|1-27|+35-33+(2-17)0-数学
• 计算：125-5215+45-12405-数学
• 计算：（1）23+312-48；（2）(2+23)2．-数学