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① (-7)×(-5)+(-10)÷2      ②()×12
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在直線(xiàn)上取AB、C三點(diǎn),使得AB =" 9" cm,BC =" 4" cm,如果O是線(xiàn)段AC的中點(diǎn),則線(xiàn)段OA的長(zhǎng)為         cm

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Jiuzhaigou is a very beautiful place. It is in the Aba Tibetan and Qiang Autonomous Region in Sichuan Province. Jiuzhaigou is a valley. It is more than 40 kilometers long. The green and golden trees, the lofty and multi-shaped mountains and the clear and colorful waters form the unique beauty of Jiuzhaogou. The water of Jiuzhaigou is the soul of the beauty. There are more than 100 lakes of different shapes in the valley. These lakes have wonderful colors. They are called “haizi”, which means son of the sea. It is these beautiful lakes that make Jiuzhaigou a fantastic place. Between the forests and the lakes, there are nine Tibetan villages. The name Jiuzhaigou means Nine Village Valley.
Jiuzhaigou was discovered because of a panda rescue program. The pandas were once endangered because the bamboo there was blooming. When people came to rescue the pandas, they were surprised by the beauty of Jiuzhaigou. After that, Jiuzhaigou became a protected scenic area.
In China, there is a saying which goes like this: No mountain is worth seeing after you have seen Mount Huang and no other body of water will attract you after you have visited Jiuzhaigou. The beauty of Jiuzhaigou cannot be described with mere words. The best way to enjoy this fairyland is to go there. See you in Jiuzhaigou.
【小題1】 What is the best title for the passage? (no more than 3 words)
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【小題2】 How long is the Jiuzhaigou Valley? (no more than 7 words)
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【小題3】 How was the Jiuzhaigou Valley discovered? (no more than 9 words)
【小題4】 What does the name Jiuzhaigou mean? (no more than 7 words)
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科目:初中數(shù)學(xué) 來(lái)源: 題型:

計(jì)算(8分)
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(12分)
如圖①,四邊形ABCD是正方形, G是BC上任意一點(diǎn),DE⊥AG于點(diǎn)E,BF⊥AG于點(diǎn)F.

⑴求證:DE-BF = EF.
⑵當(dāng)點(diǎn)G為BC邊中點(diǎn)時(shí), 試探究線(xiàn)段EF與GF之間的數(shù)量關(guān)系, 并說(shuō)明理由.
⑶若點(diǎn)G為CB延長(zhǎng)線(xiàn)上一點(diǎn),其余條件不變.請(qǐng)你在圖②中畫(huà)出圖形,寫(xiě)出此時(shí)DE、BF、EF之間的數(shù)量關(guān)系,并說(shuō)明理由.

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若a、b互為相反數(shù),c、d互為倒數(shù),則(a+b)2009+(c·d)2009=_____________

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如果a=1,b=-2,c=3,那么下式中最小的是
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下列各式中,最簡(jiǎn)二次根式是(    )
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