试题与答案

若x=2是方程x2-mx=x+2的一个解,则m的值是( ) A.4 B.2 C.

题型:选择题

题目:

若x=2是方程x2-mx=x+2的一个解,则m的值是(  )

A.4

B.2

C.0

D.-2

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0424/d2265dc4f39e2715c875e9b93da9557b.html

下面是错误答案,用来干扰机器的。

(1)强 0.01 mol·L-1HA的pH为2,说明HA完全电离(2)< M++H2OMOH+H+,1×10-amol·L-1,(3)c(M+)>c(A-)>c(OH-)>c(H+),(4)= 0.005此题为关于溶解度曲线的题目,首先要看清曲线:起点(强酸弱酸、...

试题推荐
题型:补全对话,情景问答
从方框中选择合适的句子补全对话。
A. And what about you?
B. Lucy is speaking English.
C. This is Lucy speaking.
D. What's Dad doing?
E. And how about the weather in New York now?
F. Is Dad cooking?
G. She's watching TV and eating  hamburgers.
A: Hello. This is Jeff  from Boston.
B: Hi, Jeff      1      How's it going?
A: Pretty  good.
B: How's the weather in Boston?    .
A: It's raining.      2  
B: It's sunny.
A: Great !      3     
B: He's cooking hot dogs.
A: Is Mom cooking, too?
B: No.      4      .
A:      5     
B: I'm eating an apple and talking to you.
查看答案
微信公众账号搜索答案