【单选题】【消耗次数：1】
任一有界变差函数都可以写成
①
两个增函数之和
②
两个增函数之差
③
两个增函数之积
④
两个增函数之商
参考答案：
复制
纠错
相关题目
【单选题】
下列函数中是增函数的是（ ）
①
<img src="20190730/1564477377822527.png" title="1564477377822527.png" alt="图片117.png"/>
②
<img src="20190730/1564477370221072.png" title="1564477370221072.png" alt="图片116.png"/>
③
<img src="20190730/1564477418409058.png" title="1564477418409058.png" alt="图片118.png"/>
【单选题】
下列函数中既是奇函数又是增函数的是（ ）
①
<img class="kfformula" src="20190808/1565254637580775.png" data-latex="y=\frac {1} {x}"/>
②
<img class="kfformula" src="20190808/1565254637194153.png" data-latex="y=-\frac {1} {3}x"/>
③
<img class="kfformula" src="20190808/1565254637543456.png" data-latex="y=3x"/>
④
<img class="kfformula" src="20190808/1565254637197572.png" data-latex="y=2{x}^{2}"/>
随机题目
【判断题】
Human mind remembers spatial, personal, surprising, humorous, or other meaningful or funny information much more easily.
①
正确
②
错误
【单选题】
Learning English words consists of two major tasks: _______.
①
pronouncing a word and spelling a word
②
pronouncing a word and using a word
③
knowing a word and spelling a word
④
knowing a word and using a word
【单选题】
“Ask a teacher for an L1 translation”belongs to _______ strategy.
①
social
②
cognitive
③
determination
④
memory
【单选题】
Lexical competence consists of _______.
①
pronunciation knowledge and productive knowledge
②
receptive knowledge and productive knowledge
③
pronunciation knowledge and receptive knowledge
④
spelling knowledge and productive knowledge
【判断题】
Audience is the only factor that a speaker/writer needs to consider when making a choice of words.
①
正确
②
错误
【判断题】
The most notable language variation is at the level of words people choose --- lexical variation.
①
正确
②
错误
【判断题】
An adverb collocation refers to a chunk that is often used adverbially, with or without an adverb in it.
①
正确
②
错误
【单选题】
For formal English, we’d better NOT choose_______.
①
words of glorification
②
verbs of action
③
words of strength
④
peculiar words