【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】
sin(-1230°)的值是( )
①
<img src="20190823/1566525890759434.jpg" title="1566525890759434.jpg" alt="图片2.jpg"/>
②
<img src="20190823/1566525904186046.jpg" title="1566525904186046.jpg" alt="图片4.jpg"/>
③
<img src="20190823/1566525898758059.jpg" title="1566525898758059.jpg" alt="图片3.jpg"/>
④
<img src="20190823/1566525882547844.jpg" title="1566525882547844.jpg" alt="图片1.jpg"/>
【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】
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"/>