当x=2.6时,8x+2x-2.6的值是______.

题型:填空题

问题:

当x=2.6时,8x+2x-2.6的值是______.

考点:用字母表示数
题型:填空题

利用获利指数对投资项目进行互斥方案评价时,应选择获利指数最高的方案为最优。( )

题型:填空题

根据短文内容,判断下列句子的正误(T/F)。

     What's your favorite weather? Do you like sunny or rainy days? Many people like sunshine (阳光) a lot.

They don't like rain. They think rain makes them feel sad. During a long vacation, they like going to the beach

to enjoy sunshine. Sunshine can make them feel good and happy. I like sunshine very much, but I also enjoy

rain.

     I enjoy the sound of rain. It can make me feel quiet. On rainy days, I like listening to music and doing some

reading, or just looking at the rain and daydreaming (做白日梦). When you daydream, you don't have to think

about other things. I think it's a good way to relax when it rains.

     Sunshine can make one run around and rain can make one keep quiet. I hope you can feel happy no matter

(无论) it rains or it' sunny.

( )1. Many people don't like rain because it can make them feel sad.

( )2. The writer enjoys rain but he doesn't like sunshine.

(     )3. The writer enjoys rain because it makes him feel quiet.

(     )4. The writer thinks it's nice to relax in the sunshine.

(     )5. The writer hopes everyone can feel happy no matter how the weather is.

题型:填空题
已知:函数f(x)=ax+
b
x
+c
(a、b、c是常数)是奇函数,且满足f(1)=
5
2
,f(2)=
17
4

(Ⅰ)求a、b、c的值;
(Ⅱ)试判断函数f(x)在区间(0,
1
2
)
上的单调性并证明.
题型:填空题

乘车证限乘车证上所填写的持用人在()和()使用。

题型:填空题

调节阀按调节形式可分为()种

A、调节型

B、切断型

C、调节切断型

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