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已知x+y=-4,xy=-12,则y+1x+1+x+1y+1的值是______.-数学
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先化简,再求值(1)12m2-9+23-m,其中m=-4(2)求(3xx-1-2xx+1)÷xx2-1的值,其中x=-2.-数学
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(2013·福建毕业班质检)It is said that sixty percent of all energy ________ in the world today is being lost
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I send you 100 dollars today, the rest in a year.A.followsB.followedC.to followD.being followed-高一英语
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先化简再求值:(3x-1-1x+1)÷xx2-1,其中x=12.-数学
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— Could you introduce me a high quality car? — My pleasure._______ well even on wet roads, this kind
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He drank up the whole bottle of milk,not even a drop to his little brother.A.1eaveB.leaving C.1eftD.
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先化简,再把x取一个你最喜欢的数代入求值:。-九年级数学
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已知x2=y3=z4=k,求2x+y-z3x-2y+z的值.-数学
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已知求的值.-八年级数学
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化简或计算(1)m2m-2+42-m(2)x-32x-4÷(5x-2-x-2).-数学
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计算:1x+1-1x2-1×x2-2x+1x+1.-数学
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一艘轮船在静水中的最大航速为20千米/时,它沿江以最大航速顺流航行100千米所用时间,与以最大航速逆流航行60千米所用时间相等,江水的流速为多少?-八年级数学
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计算:①(a2a-b+b2b-a)÷a+ba-b;②先化简:a2-b2a2-ab÷(a+2ab+b2a),当b=-1时,请你为a任选一个适当的数代入求值.-数学
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联系实际编拟一道关于分式方程的应用题,要求表述完整,条件充分,不需解答。-八年级数学
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先化简,再求值a2-b2a2b+ab2÷(1-a2+b22ab),其中a=2+3,b=2-3.-数学
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(1)先化简,再求值:(a2-5a+2a+2+1)÷a2-4a2+4a+4,其中a=2+3.(2)阅读下边一元二次方程求根公式的两种推导方法:方法一:(教材中方法)方法二:∵ax2+bx+c=0,∵a
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according to the instructions,the medicine will work for your headache.A.To takeB.TakingC.TakenD.Tak
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(1)化简:x2x-2-4xx-2+4x-2(2)先化简代数式(a+1a-1+1a2-2a+1)÷aa-1,然后选取一个你喜欢的a值代入求值.-数学
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_______ which university to attend, the girl asked her teacher for advice.A.Not knowingB.Knowing not
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计算(1)12xy5a÷9x2y(2)先化简,再求值:(1x-1y)÷y-x3x2,其中x=2,y=3.-数学
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已知1x-1y=2,则5x+xy-5yx-xy-y等于()A.13B.-13C.-3D.3-数学
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计算:(xx-y-2yx-y)÷x-2yxy•(1x+1y)-数学
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计算:(1-1a+1)÷a2-aa+1.-数学
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某服装店用960元购进一批服装,并以每件46元的价格全部售完,由于服装畅销,服装店又用2220元,再次以比第一次进价多5元的价格购进服装,数量是第一次购进服装的2倍,仍以每-八年级数学
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现要装配30台机器,在装配好6台以后,采用了新的技术,每天的工作效率提高了一倍,结果共用了3天完成任务,求原来每天装配机器的台数x,下列所列方程中不正确的是[]A.B.C.-八年级数学
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甲乙两人加工同一种玩具,甲加工90个玩具所用的时间与乙加工120个玩具所用的时间相等,已知甲乙两人每天共加工35个玩具,求甲乙两人每天各加工多少个玩具?-八年级数学
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先化简,再求值:m2-2m+1m2-1÷(m-1-m-1m+1),其中m=2-3.-数学
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The US federal government has released 252 applications so far, ______ fields including education an
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I had a busy and tiring weekend because ______ the house for the Christmas cost me a whole day.A.dec
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Napoleon is famously said ______, "When China wakes, it will shake the world."A.to declare
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Chinadaily. com. cn is the largest English portal site in China, news, business information and lea
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The picture shows my mother is sitting by my bed, ______ me stories till I fell asleep.A.having told
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先化简,再求值:,其中。-九年级数学
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________ on the endless green grass are sheep, cattle and horses.A.Being wanderedB.Being wanderingC
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—They are quiet, aren’t they? —Yes. They are accustomed ________ at meals.A.to talkB.to not talkC.to
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计算x-1x÷(x-1x)的结果为()A.1B.x-1x2-1C.1x-1D.1x+1-数学
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化简(x3yz)2÷(-xzy)•yx2z,结果是()A.y2z2x2B.-x5y2z3C.-x3y4z4D.x4z3z2-数学
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先化简,再求值:a2-3aa2+4a+4÷a-3a+2-2a+2,其中a=3-2.-数学
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小强的爸爸开汽车到距离xkm外的单位去上班,在正常情况下经过yh可以到达.但是有一天由于汽车需要维修晚出发zh,小强的爸爸每小时应该多走多少km,才能按时到达单位?-数学
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, he dialed 999. A.Seen the house on fireB.To see the house on fireC.Being seen the house on fireD.
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计算:(1)(x-y+4xyx-y)•(x+y-4xyx+y)(2)1x2+3x+2+1x2+5x+6+1x2+7x+12.-数学
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先化简,再求值:÷,其中,.-九年级数学
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The recorder doesn’t work. Something seems ______ wrong with it.A.to go B.to have goneC.goingD.havin
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---The film deserves ______ a second time. ---Sorry, I can’t follow you clearly. ---I said that the
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If the bike is broken again, you'll have to pay to _____ .A.get it repaired B.have it repairC.
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先化简,再求值:,其中,。-九年级数学
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---- How about the party ______ in Tom’s house last night ? ---- I don’t know. I was too busy to att
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Our school was going to send a teacher to Xinjiang . I was the first person _______ to go.A.voluntee
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当a=99时,分式a2-1a-1的值是______.-数学
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化简:=()。-八年级数学
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