【单选题】
不等式<img class="kfformula" src="20190808/1565250723184457.png" data-latex="{x}^{2}-2x-80"/>的解集是( )
①
<img class="kfformula" src="20190808/1565250723229267.png" data-latex="\left ( {4,+\infty } \right )"/>
②
<img class="kfformula" src="20190808/1565250723616994.png" data-latex="\left ( {-\infty ,-2} \right )\cup \left ( {4,+\infty } \right )"/>
③
<img class="kfformula" src="20190808/1565250723532354.png" data-latex="\left ( {-\infty ,-2} \right )"/>
④
<img class="kfformula" src="20190808/1565250723744347.png" data-latex="\left ( {-2,4} \right )"/>
【单选题】
150°是多少( )弧度
①
<img class="kfformula" src="20190808/1565257005999778.png" data-latex="\frac {\pi } {3}" width="86" height="74"/>
②
<img class="kfformula" src="20190808/1565257005588648.png" data-latex="\frac {2\pi } {3}" width="84" height="58"/>
③
<img class="kfformula" src="20190808/1565257005206984.png" data-latex="\frac {\pi } {6}" width="76" height="63"/>
④
<img class="kfformula" src="20190808/1565257005614576.png" data-latex="\frac {5\pi } {6}" width="76" height="66"/>
【单选题】
<img src="20190808/1565258038310996.png" title="1565258038310996.png" alt="3.png"/>( )
【单选题】
<img src="20190823/1566539484784649.jpg" title="1566539484784649.jpg" alt="360截图20190823135116176.jpg"/>,则x在( )
【单选题】
如果<img class="kfformula" src="20190808/1565251013539366.png" data-latex="ab"/>,那么下列不等式正确的是( )
①
<img class="kfformula" src="20190808/1565251013586057.png" data-latex="\frac {1} {2}a\frac {1} {2}b"/>
②
<img class="kfformula" src="20190808/1565251013931183.png" data-latex="-3a-3b"/>
③
<img class="kfformula" src="20190808/1565251013130324.png" data-latex="5a5b"/>
④
<img class="kfformula" src="20190808/1565251013738499.png" data-latex="a-2b-2"/>
【单选题】
抛物线<img src="20190730/1564474429997320.png" title="1564474429997320.png" alt="图片60.png"/>的顶点坐标是( )
【单选题】
函数<img src="20190730/1564474143666452.png" title="1564474143666452.png" alt="图片52.png"/>是 ()
【单选题】
下列函数中,在<img src="20190730/1564473949495175.png" title="1564473949495175.png" alt="图片46.png"/>内是减函数的为( )
①
<img src="20190730/1564474090983745.png" title="1564474090983745.png" alt="图片50.png"/>
②
<img src="20190730/1564474069714722.png" title="1564474069714722.png" alt="图片51.png"/>
③
<img src="20190730/1564473984807752.png" title="1564473984807752.png" alt="图片47.png"/>
④
<img src="20190730/1564474084192474.png" title="1564474084192474.png" alt="图片49.png"/>
【单选题】
函数<img src="20190730/1564473516427153.png" title="1564473516427153.png" alt="图片32.png"/>的图像是()
【单选题】
某公司销售某产品的利润函数为<img class="kfformula" src="20190808/1565255089180842.png" data-latex="y=-100{x}^{2}+1500x-5400"/>(<img class="kfformula" src="20190808/1565255089940036.png" data-latex="x" width="61" height="43"/>为销售价格),当零售价为7.5元时,销售利润最大,最大利润为( )