若函数y=a2x+b+1(a>0且a≠1,b为实数)的图象恒过定点(1,2),求

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问题:

若函数y=a2x+b+1(a>0且a≠1,b为实数)的图象恒过定点(1,2),求b的值______.

考点:指数函数模型的应用
题型:填空题

Everyone has their own way of learning a foreign language. When I was ten years old, I _______(开始)to chat with foreigners. But I was very shy. G________, I became more and more confident with their help. The f______ year, I went to Yangzhou with two foreigners. I became their g____. First, we came into the Shouxi River, which they wanted to look around ______ boat. After that, they wanted to buy some souvenirs. The sellers couldn’t speak English, _____I tried my best to put_______ they said into English. Next, we went to a small zoo, where we took some _______.This was an unforgettable _____(挑战). I hope I can catch many opportunities in the in the future, then I can speak English, because I think practice makes ______.

题型:填空题

在小于临界水深时,断面单位能量随水深减小( )。

A.(A) 不变

B.(B) 增加

C.(C) 减小

D.(D) 不确定

题型:填空题

分子不是静止的,而总是在______,分子间有一定的______.如果______很______时,物质呈气态;______很______,则呈液态或固态.

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牡丹皮、紫花地丁、红藤、败酱草、芒硝均可用治()。

A.肺痈

B.肠痈

C.乳痈

D.喉痈

E.瘰疬

题型:填空题

干旱缺水对农业和社会造成的损失相当于其他各自然灾害造成损失之总和。

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