在[img=18x22]180346cfb4bd026.png[/img]中与(123)不交换的元素有()个。
A: 0
B: 2
C: 3
D: 4
A: 0
B: 2
C: 3
D: 4
举一反三
- 已知三次函数f(x)=(1/3)[img=18x22]1802e2b148262dd.png[/img]-(4m-1)[img=18x22]1802e2b1512ca3b.png[/img]+(15[img=23x22]1802e2b159732bb.png[/img]-2m-7)x+2在x∈(-∞,+∞)是增函数,则m的取值范围是(). A: m<2或m>4 B: -4<m<-2 C: 2<m<4 D: m>4
- 若 X, Y,满足DX=DY=[img=18x22]1803dfef6dae947.png[/img],E(XY)=EXEY,则D(X-2Y)的值是( )(A)2 [img=18x22]1803dfef6dae947.png[/img] (B)3 [img=18x22]1803dfef6dae947.png[/img] (C)4 [img=18x22]1803dfef6dae947.png[/img] (D)5[img=18x22]1803dfef6dae947.png[/img] A: 2 [img=18x22]1803dfef98590fb.png[/img] B: 3 [img=18x22]1803dfef98590fb.png[/img] C: 4 [img=18x22]1803dfef98590fb.png[/img] D: 5[img=18x22]1803dfef98590fb.png[/img]
- 若 X, Y,满足DX=DY=[img=18x22]17de6024b9b2db4.png[/img],E(XY)=EXEY,则D(X-2Y)的值是( )(A)2 [img=18x22]17de6024b9b2db4.png[/img] (B)3 [img=18x22]17de6024b9b2db4.png[/img] (C)4 [img=18x22]17de6024b9b2db4.png[/img] (D)5[img=18x22]17de6024b9b2db4.png[/img] 未知类型:{'options': ['2[img=18x22]17de6024b9b2db4.png[/img]', '3[img=18x22]17de6024b9b2db4.png[/img]', '4[img=18x22]17de6024b9b2db4.png[/img]', '5[img=18x22]17de6024b9b2db4.png[/img]'], 'type': 102}
- 已知三次函数f(x)=(1/3)[img=18x22]1802e2afaa1406d.png[/img]-(4m-1)[img=18x22]1802e2afb285c5b.png[/img]+(15[img=23x22]1802e2afbc0300d.png[/img]-2m-7)x+2在x∈(-∞,+∞)是增函数,则m的取值范围是(). A: m<2或m>4 B: -4<m<-2 C: 2<m<4 D: 以上都不对
- 集合[img=203x25]17de8740c758bad.png[/img]中元素个数为()个 A: 1 B: 2 C: 3 D: 4