【单选题】
下面哪个函数是幂函数( )
①
<img src="20190730/1564475986128388.png" title="1564475986128388.png" alt="图片93.png"/>
②
<img src="20190730/1564475975460520.png" title="1564475975460520.png" alt="图片91.png"/>
③
<img src="20190730/1564475981209526.png" title="1564475981209526.png" alt="图片92.png"/>
④
<img src="20190730/1564475991560721.png" title="1564475991560721.png" alt="图片94.png"/>
【单选题】
函数<img class="kfformula" src="20190730/1564477332852828.png" data-latex="y={log}_{5}\left ( {x-2} \right )"/>的定义域是()
【单选题】
<img class="kfformula" src="20190730/1564475645410465.png" data-latex="{5}^{-1}"/>等于()
①
<img class="kfformula" src="20190730/1564475645509248.png" data-latex="-\frac {1} {5}" width="96" height="63"/>
②
<img class="kfformula" src="20190730/1564475645473521.png" data-latex="\frac {1} {5}" width="94" height="63"/>
③
<img class="kfformula" src="20190730/1564475645939907.png" data-latex="-5"/>
④
<img class="kfformula" src="20190730/1564475645707520.png" data-latex="5"/>
【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】
设<img src="20190730/1564476170283010.png" title="1564476170283010.png" alt="图片98.png"/>,则下列结论不成立的是()
①
<img src="20190730/1564476255588926.png" title="1564476255588926.png" alt="图片99.png"/>的图象关于轴对称
②
<img src="20190730/1564476243573541.png" title="1564476243573541.png" alt="图片99.png"/>的图象都经过点(0,1)
③
<img src="20190730/1564476221305162.png" title="1564476221305162.png" alt="图片99.png"/>的值域都是R
④
<img src="20190730/1564476237430759.png" title="1564476237430759.png" alt="图片99.png"/>的定义域都是R
【单选题】
下列函数中,在区间<img class="kfformula" src="20190808/1565255863544549.png" data-latex="\left ( {-\infty ,+\infty } \right )"/>内为增函数的是( )
①
<img class="kfformula" src="20190808/1565255863279980.png" data-latex="y=2-x"/>
②
<img class="kfformula" src="20190808/1565255863845028.png" data-latex="y={3}^{x}"/>
③
<img class="kfformula" src="20190808/1565255863797150.png" data-latex="y={x}^{-2}"/>
④
<img class="kfformula" src="20190808/1565255863844363.png" data-latex="y={log}_{0.3}x"/>
【单选题】
<img class="kfformula" src="20190808/1565256297772060.png" data-latex="\sqrt {\left ( {lg5-1} \right )^{2}}"/>的值等于( )
①
<img class="kfformula" src="20190808/1565256297983776.png" data-latex="lg\frac {1} {5}"/>
②
<img class="kfformula" src="20190808/1565256297148379.png" data-latex="lg5-1"/>
③
<img class="kfformula" src="20190808/1565256297764160.png" data-latex="lg5"/>
④
<img class="kfformula" src="20190808/1565256297303551.png" data-latex="lg2"/>
【单选题】
<img src="20190808/1565257485671417.png" title="1565257485671417.png" alt="图片122.png"/>
【单选题】
120°是多少( )弧度
①
<img class="kfformula" src="20190808/1565256897593693.png" data-latex="\frac {\pi } {6}" width="86" height="55"/>
②
<img class="kfformula" src="20190808/1565256897599656.png" data-latex="\frac {2\pi } {3}" width="87" height="63"/>
③
<img class="kfformula" src="20190808/1565256897738219.png" data-latex="\frac {\pi } {3}" width="86" height="73"/>
④
<img class="kfformula" src="20190808/1565256897259624.png" data-latex="\frac {5\pi } {6}" width="76" height="63"/>
【单选题】
<img src="20190808/1565257767420227.png" title="1565257767420227.png" alt="1.png"/>( )