Determine whether this formula is correct:[img=287x25]1803a1c0b6e74bf.png[/img]
举一反三
- Which is correct in the following formula? A: [img=295x25]1803a1c1460a5c9.png[/img] B: [img=291x25]1803a1c1506a2e1.png[/img] C: [img=291x25]1803a1c15b2965e.png[/img] D: [img=287x25]1803a1c16805fa1.png[/img]
- Which is correct in the following formula? A: [img=295x25]1803a1c0787d44e.png[/img] B: [img=291x25]1803a1c08400e18.png[/img] C: [img=291x25]1803a1c08ecf5b4.png[/img] D: [img=287x25]1803a1c0976d631.png[/img]
- To determine whether a straight line is parallel to a plane?[img=280x290]17d607f8cd019da.png[/img]
- ${\rm var}(X)=\,$ ${\bf E}[X]=\,$ ${\bf P}(X=3)=\,$ ${\bf P}(X=-2)=\,$ ${\bf P}(X=1)=\,$ ${\bf P}(X=0)=\,$______
- ${\bf P}(X=-2)=\,$ ${\bf P}(X=1)=\,$ ${\bf P}(X=0)=\,$______