方程lnx+2x-8=0的根为m，m∈[t，t+1]，t∈Z，则t=_______爱下问搜题

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问题填空题

方程lnx+2x-8=0的根为m，m∈[t，t+1]，t∈Z，则t=______．

答案

令f（x）=lnx+2x-8，则f（x）在其定义域（0，+∞）上是单调增函数，f（3）=ln3-2＜0，

f（4）=ln4＞0，∴函数f（x）的零点 m∈[3，4]，∴t=3，

故答案为：3．

完形填空

完形填空。

Sunday____1____ the favourite day for our family. My parents____2____ not____3____work. My
sister and I ___4___go to school. We___5____at home and____6____ in the morning. In the afternoon, my sister and I ____7____ out to buy some different things. My sister likes songs. She _____8___ new
tapes. I buy story books, a frisby, a kite and things____9____ that. We also buy some small gifts (礼物)
for our parents. We___10_____ them. They love us very much. We live in a happy family.

( ) 1. A. is
( ) 2. A. is
( ) 3. A. on
( ) 4. A. don't
( ) 5. A. play
( ) 6. A. play
( ) 7. A. going
( ) 8. A. buys
( ) 9. A. look like
( ) 10.A. love

B. are
B. are
B. in
B. doesn't
B. go
B. playing
B. go
B. buying
B. looks like
B. have

C. comes
C. do
C. do
C. can't
C. stay
C. to play
C. goes
C. to buy
C. likes
C. has

D. goes
D. does
D. at
D. aren't
D. come
D. plays
D. are
D. buies
D. like
D. loves

单项选择题

在16位C编译系统上，若定义long a；，则能给a赋40000的正确语句是

A．a=20000+20000；

B．a=4000*10；

C．a=30000+10000；

D．a=4000L*10L；