设某直线的参数方程为[img=123x71]1802cfc4b3824e6.png[/img]，则该直线的对称式方程为（ ）．
A: [img=125x44]1802cfc4bf1c4e7.png[/img]
B: [img=157x44]1802cfc4c762c4e.png[/img]
C: [img=125x44]1802cfc4d231bda.png[/img]
D: [img=125x44]1802cfc4dd536ab.png[/img]
A: [img=125x44]1802cfc4bf1c4e7.png[/img]
B: [img=157x44]1802cfc4c762c4e.png[/img]
C: [img=125x44]1802cfc4d231bda.png[/img]
D: [img=125x44]1802cfc4dd536ab.png[/img]
举一反三
- 设某直线的参数方程为[img=123x71]18039c950452887.png[/img]，则该直线的对称式方程为（ ）． A: [img=125x44]18039c950e779b3.png[/img] B: [img=157x44]18039c9516e7511.png[/img] C: [img=125x44]18039c9520d4922.png[/img] D: [img=125x44]18039c952c22d40.png[/img]
- 设某直线的参数方程为[img=123x71]1803653668f04cf.png[/img]，则该直线的对称式方程为（ ）． A: [img=125x44]180365367594a62.png[/img] B: [img=157x44]180365367f463b4.png[/img] C: [img=125x44]180365368aba906.png[/img] D: [img=125x44]18036536968d7e4.png[/img]
- 设某直线的参数方程为[img=123x71]18036ee49e6095a.png[/img]，则该直线的对称式方程为（ ）． A: [img=125x44]18036ee4a95c3e5.png[/img] B: [img=157x44]18036ee4b23f787.png[/img] C: [img=125x44]18036ee4bdbcac7.png[/img] D: [img=125x44]18036ee4c9399af.png[/img]
- 设某直线的参数方程为[img=123x71]17da62f1b25294f.png[/img],则该直线的对称式方程为( ). 未知类型：{'options': ['', ' [img=125x44]17da62f1fa6bae0.png[/img]', ' [img=125x44]17da62f21aa3a1f.png[/img]', ' [img=125x44]17da62f2371168c.png[/img]'], 'type': 102}
- 设[img=77x19]1802e2aa5a4095f.jpg[/img]，则E(X)=4，D(X)=4/3.