【单选题】
函数img class=kfformula src=zzximg/20190808/1565253438624934.png data-latex=y=2-{x}^{2}/的单调递减区间是( )
①
img class=kfformula src=zzximg/20190808/1565253438117832.png data-latex=\left ( {0,+\infty } \right )/
②
img class=kfformula src=zzximg/20190808/1565253438467999.png data-latex=\left ( {-\infty ,0} \right )/
③
img class=kfformula src=zzximg/20190808/1565253438403956.png data-latex=\left ( {-\infty ,-1} \right )/
④
img class=kfformula src=zzximg/20190808/1565253438303182.png data-latex=\left ( {-1,+\infty } \right )/
【单选题】
已知img class=kfformula src=zzximg/20190809/1565322050560879.png data-latex=A\left ( {0,-2} \right )/img class=kfformula src=zzximg/20190809/1565322050489966.png data-latex=B\left ( {x,6} \right )/的中点坐标为img class=kfformula src=zzximg/20190809/1565322050782302.png data-latex=\left ( {-1,y} \right )/img class=kfformula src=zzximg/20190809/1565322050701271.png data-latex=x/img class=kfformula src=zzximg/20190809/1565322050277662.png data-latex=y/的值分别为( )
①
img class=kfformula src=zzximg/20190809/1565322050607462.png data-latex=x=2,y=4/
②
img class=kfformula src=zzximg/20190809/1565322050205695.png data-latex=x=-2,y=2/
③
img class=kfformula src=zzximg/20190809/1565322050358526.png data-latex=x=-4,y=-2/
④
img class=kfformula src=zzximg/20190809/1565322050656212.png data-latex=x=-4,y=25/
【单选题】
二次函数img class=kfformula src=zzximg/20190808/1565254258613538.png data-latex=y={x}^{2}+mx+6/的顶点img class=kfformula src=zzximg/20190808/1565254258861129.png data-latex=\left ( {-1,5} \right )/img class=kfformula src=zzximg/20190808/1565254258615064.png data-latex=m/的值为( )
【单选题】
函数<img class="kfformula" src="20190808/1565253438624934.png" data-latex="y=2-{x}^{2}"/>的单调递减区间是( )
①
<img class="kfformula" src="20190808/1565253438467999.png" data-latex="\left ( {-\infty ,0} \right )"/>
②
<img class="kfformula" src="20190808/1565253438403956.png" data-latex="\left ( {-\infty ,-1} \right )"/>
③
<img class="kfformula" src="20190808/1565253438303182.png" data-latex="\left ( {-1,+\infty } \right )"/>
④
<img class="kfformula" src="20190808/1565253438117832.png" data-latex="\left ( {0,+\infty } \right )"/>
【单选题】
不等式img class=kfformula src=zzximg/20190808/1565250723184457.png data-latex={x}^{2}-2x-80/的解集是( )
①
img class=kfformula src=zzximg/20190808/1565250723744347.png data-latex=\left ( {-2,4} \right )/
②
img class=kfformula src=zzximg/20190808/1565250723532354.png data-latex=\left ( {-\infty ,-2} \right )/
③
img class=kfformula src=zzximg/20190808/1565250723616994.png data-latex=\left ( {-\infty ,-2} \right )\cup \left ( {4,+\infty } \right )/
④
img class=kfformula src=zzximg/20190808/1565250723229267.png data-latex=\left ( {4,+\infty } \right )/
【单选题】
已知<img class="kfformula" src="20190809/1565322050560879.png" data-latex="A\left ( {0,-2} \right )"/>,<img class="kfformula" src="20190809/1565322050489966.png" data-latex="B\left ( {x,6} \right )"/>的中点坐标为<img class="kfformula" src="20190809/1565322050782302.png" data-latex="\left ( {-1,y} \right )"/>,则<img class="kfformula" src="20190809/1565322050701271.png" data-latex="x"/>,<img class="kfformula" src="20190809/1565322050277662.png" data-latex="y"/>的值分别为( )
①
<img class="kfformula" src="20190809/1565322050358526.png" data-latex="x=-4,y=-2"/>
②
<img class="kfformula" src="20190809/1565322050607462.png" data-latex="x=2,y=4"/>
③
<img class="kfformula" src="20190809/1565322050656212.png" data-latex="x=-4,y=25"/>
④
<img class="kfformula" src="20190809/1565322050205695.png" data-latex="x=-2,y=2"/>
【单选题】
在直角坐标系中,函数img class=kfformula src=zzximg/20190808/1565254063454992.png data-latex=y={x}^{2}+2/的图像( )
【单选题】
二次函数<img class="kfformula" src="20190808/1565254258613538.png" data-latex="y={x}^{2}+mx+6"/>的顶点<img class="kfformula" src="20190808/1565254258861129.png" data-latex="\left ( {-1,5} \right )"/>,则<img class="kfformula" src="20190808/1565254258615064.png" data-latex="m"/>的值为( )
【单选题】
两条平行直线img class=kfformula src=zzximg/20190809/1565322829875215.png data-latex=3x+4y-7=0/img class=kfformula src=zzximg/20190809/1565322829154016.png data-latex=3x+4y+8=0/之间的距离是( )
①
img class=kfformula src=zzximg/20190809/1565322829833725.png data-latex=\frac {1} {5} width=87 height=63/
②
img class=kfformula src=zzximg/20190809/1565322829406438.png data-latex=15/
③
img class=kfformula src=zzximg/20190809/1565322829721740.png data-latex=3\sqrt {2}/
④
img class=kfformula src=zzximg/20190809/1565322829886592.png data-latex=3/
【单选题】
img class=kfformula src=zzximg/20190808/1565256297772060.png data-latex=\sqrt {\left ( {lg5-1} \right )^{2}}/的值等于( )
①
img class=kfformula src=zzximg/20190808/1565256297148379.png data-latex=lg5-1/
②
img class=kfformula src=zzximg/20190808/1565256297764160.png data-latex=lg5/
③
img class=kfformula src=zzximg/20190808/1565256297303551.png data-latex=lg2/
④
img class=kfformula src=zzximg/20190808/1565256297983776.png data-latex=lg\frac {1} {5}/
【单选题】
img class=kfformula src=zzximg/20190808/1565256388580621.png data-latex={25}^{\frac {3} {2}}=/( )