已知a5-a4b-a4+a-b-1=0，且2a-3b=1，則a3+b3的值等于______．

已知：|2x-10|+（y+2）2=0，求xy的值．

(北京卷)32. --- Where did you put the car keys？--- Oh, I ________ I put them on the chair because the phone rangas I ______ in.
A. remembered ; comeB. remembered ; was comingC. remember ; comeD. remember ; was coming

．2009年我國面臨650萬大學(xué)生就業(yè)問題。政府和教育部門采取多項措施促進大學(xué)生就業(yè)，引導(dǎo)和鼓勵大學(xué)生面向基層。如果你是一名大學(xué)生，作出的正確選擇應(yīng)該①符合正確的就業(yè)觀②符合社會現(xiàn)實和人民的需要③把追求個人價值放在首位④在個人與社會的統(tǒng)一中實現(xiàn)人生價值
A．①②③B．②③④C．①②④D．①③④

在數(shù)軸上，點A表示數(shù)-1，距A點2.5個單位長度的點表示的數(shù)是。

Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context. When I was 8 years old, I once decided to run away from home. With my suitcase 36 and some sandwiches in a bag, I started for the front door and said to Mom, “I’m leaving.” “If you want to 37 , that’s all right,” she said. “But you came into this home without anything and you can leave the same way.” I 38 my suitcase and sandwiches on the floor heavily and started for the door again. “Wait a minute,” Mom said. “I want your 39 back. You didn’t wear anything when you arrived.” This really angered me. I tore my clothes off—shoes, socks, underwear and all—and 40 , “Can I go now？” “Yes,” Mom answered, “but once you close that door, don’t expect to come back.” I was so 41 that I slammed (砰地關(guān)上) the door and stepped out on the front porch. 42 I realized that I was outside, with nothing on. Then I noticed that down the street, two neighbor girls were walking toward our house. I ran to 43 behind a big tree in our yard at once. After a while, I was 44 the girls had passed by. I dashed to the front door and banged on it loudly. “Who’s there？” I heard. “It’s Billy! Let me in!” The voice behind the 45 answered, “Billy doesn’t live here anymore. He ran away from home.” Glancing behind me to see if anyone else was coming, I begged, “Aw, c’mon, Mom! I’m 46 your son. Let me in!” The door inched open and Mom’s smiling face appeared. “Did you change your 47 about running away？” she asked. “What’s for supper？” I answered. (277 words)
A. packed
A.returnedB.cleanedC.repaired

某市在今年4月份突遇大風，冰雹災(zāi)害性天氣，造成直接經(jīng)濟損失5000萬元．5000萬元用科學(xué)記數(shù)法表示為（）
A．5000萬元B．5×102萬元C．5×103萬元D．5×104萬元

1-2的相反數(shù)是______，絕對值是______，倒數(shù)是______．

已知有理數(shù)a等于它的相反數(shù)，有理數(shù)b等于它的倒數(shù)．求a2008+b2005的值．

若代數(shù)式3x2﹣2x+5的值是6，則代數(shù)式6x2﹣4x﹣9的值是（）。

計算：（-3ab3）2=（）

某店進了一批貨，有兩種方案出售．方案一：月初出售，可獲利2000元，然后將本和利再去投資．到月未又可獲利5%；方案二：月末售出這批貨，共可獲利2500元，但要付50元的保管費。（1）寫出按方案一出售這批貨的總利潤y（元）與這批貨的成本x（元）之間的關(guān)系式；（2）要想獲得較高的利潤，請問這批貨應(yīng)按哪種方案出售。

已知：A=4x2-4xy+y2，B=x2+xy-5y2，求（3A-2B）-（2A+B）的值．

垂周分裂所形成的新細胞壁和器官表面垂直。()
A．正確B．錯誤

因式分ab-a=______．

已知代數(shù)式x+2y的值是3，則代數(shù)式2x+4y+1的值是（）。

下列函數(shù)的圖象，與y軸交點在x軸上方的是[]
A．y=﹣xB．y=x﹣1C．y=﹣5+3xD．y=﹣2x+1

下列對于細菌和真菌的敘述中，正確的是()
A．它們都過著寄生或腐生的生活B．它們都很小，必須借助于顯微鏡才能看見C．細菌都危害人體健康，真菌營養(yǎng)價值高，可以食用D．細菌沒有成形的細胞核，真菌具有真正的細胞核

“中國國家館”作為2010年上海世博會的主題場館，充分體現(xiàn)了中國文化的精神與氣質(zhì)．資料表明，在建設(shè)過程中使用的一種工藝，需要對中國館的大臺階進行約5.4×107次加工．其中5.4×107表示的數(shù)為（）
A．5400000B．54000000C．540000000D．5400000000

下列函數(shù)的圖象，不經(jīng)過原點的是（）
A．y=3x2B．y=2x2C．y=（x-1）2-1D．y=3x