题干

已知下列命题:

(1 )若a>0,b>0,则a+b>0;

(2 )若a≠b,则a2≠b2;

(3 ) 2 是2的平方根;

(4 )近似数0.030万,精确到十位;

(5 )代数式 3x−1 +(3x﹣1)0中,x的取值范围是x≥

1
3
.

其中真命题的个数是(   )

A:5个

B:2个

C:3个

D:4个

上一题 下一题 0.0难度 选择题 更新时间:2019-06-06 07:09:21

答案(点此获取答案解析)

C

同类题1

判断对错

小林家养一些鸡,黄鸡比白鸡少8只,白鸡的只数是黄鸡的2倍,则小林家养黄鸡8只,白鸡16只.

同类题2

从语句连贯的角度考虑,横线处应填入的是(    )

在我的梦里:所有被砍伐的森林重新绿叶葱笼,________梦境如此美好,能忍心让它仅仅是一个梦吗?

同类题3

绍兴市各地树立了各具特色的文化产业名片:新昌县做透了“旅游文化”,绍兴县做强“民营文化”,诸暨市做深了“西施文化”,嵊州市抓好了“越剧文化”。这启示我们在发展区域经济中首先应当(     )

同类题4

     Peter is thirteen years old. He is in Grade Two this year. He likes to play football and watch football matches. And he often reads newspapers. He does his best to know where and when there is going to be a football match. Now Peter is having lunch. He is listening to the radio, too. He is very happy because there is going to be a nice football match on TV at four this afternoon. He wants to watch it very much. But he is going to have English and Chinese lessons. He thinks hard and finds a way.
“ Hello, Mrs. Black,” Peter says to his teacher on the telephone, “ Peter is ill in bed. He wants to ask for half a day’s leave ( 请半天假 ).”
“ Oh, I’m sorry to hear that.” says Mrs. Black, “ But who’s that?”
“ It’s my father, Mrs. Black.”

同类题5

将方程4x+3y=12变形为用关于x的代数式表示y,则y=____ 。

小学学科试题库
初中学科试题库
高中学科试题库