【单选题】
圆心在(3,-2)且与y轴相切的圆的方程是( )
【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】
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】
经过点(0,-3)和点(-2,0)的直线的斜率为( )
①
img class=kfformula src=zzximg/20190809/1565321660113443.png data-latex=\frac {2} {3}/
②
img class=kfformula src=zzximg/20190809/1565321660704793.png data-latex=\frac {3} {2}/
③
img class=kfformula src=zzximg/20190809/1565321660224474.png data-latex=-\frac {3} {2}/
④
img class=kfformula src=zzximg/20190809/1565321660377728.png data-latex=-\frac {2} {3}/
【单选题】
一个球的直径是6cm,距球心2cm处有一截面圆,这个截面圆的半径是()
①
img class=kfformula src=zzximg/20190809/1565323084593264.png data-latex=4\sqrt {2}/
②
img class=kfformula src=zzximg/20190809/1565323084828913.png data-latex=\sqrt {5}/
③
img class=kfformula src=zzximg/20190809/1565323084235099.png data-latex=1/
④
img class=kfformula src=zzximg/20190809/1565323084316280.png data-latex=\sqrt {13}/
【单选题】
一个球的半径是2cm,/em则它的球面面积和体积分别为( )
①
img class=kfformula src=zzximg/20190809/1565328822100543.png data-latex=16\pi ,\frac {16} {3}\pi /
②
img class=kfformula src=zzximg/20190809/1565328822809093.png data-latex=8\pi ,\frac {32} {3}\pi /
③
img class=kfformula src=zzximg/20190809/1565328822421480.png data-latex=8\pi ,\frac {16} {3}\pi /
④
img class=kfformula src=zzximg/20190809/1565328822199687.png data-latex=16\pi ,\frac {32} {3}\pi /
【单选题】
在正方体img class=kfformula src=zzximg/20190809/1565328255613453.png data-latex=ABCD\_ {A}_{1}{B}_{1}{C}_{1}{D}_{1}/img class=kfformula src=zzximg/20190809/1565328255952220.png data-latex={A}_{1}B/img class=kfformula src=zzximg/20190809/1565328255653689.png data-latex=AC/所成的角是( )
【单选题】
正五棱锥的底面积是img class=kfformula src=zzximg/20190809/1565328530277328.png data-latex=26{cm}^{2}/,高是img class=kfformula src=zzximg/20190809/1565328530106797.png data-latex=6cm/,则其体积是( )。
①
img class=kfformula src=zzximg/20190809/1565328531496628.png data-latex=156{cm}^{3}/
②
img class=kfformula src=zzximg/20190809/1565328531242148.png data-latex=78{cm}^{3}/
③
img class=kfformula src=zzximg/20190809/1565328531884474.png data-latex={52cm}^{3}/
④
img class=kfformula src=zzximg/20190809/1565328531591499.png data-latex=104{cm}^{3}/
【单选题】
有100张卡片(从1号到100号),从中任取一张,取到的卡号是7的倍数的概率为( )
①
img class=kfformula src=zzximg/20190809/1565330760695228.png data-latex=\frac {7} {50} width=75 height=53/
②
img class=kfformula src=zzximg/20190809/1565330760716247.png data-latex=\frac {7} {100} width=76 height=53/
③
img class=kfformula src=zzximg/20190809/1565330760831846.png data-latex=\frac {7} {48} width=68 height=53/
④
img class=kfformula src=zzximg/20190809/1565330760810107.png data-latex=\frac {3} {20} width=68 height=53/