向量[img=69x25]180327b5cdf2a24.png[/img]与[img=55x25]180327b5d606ca0.png[/img]的夹角等于
A: [img=11x39]180327b5ddf0a9c.png[/img]
B: [img=20x43]180327b5e886c5f.png[/img]
C: [img=11x39]180327b5f1309a0.png[/img]
D: [img=11x39]180327b5fa9a714.png[/img]
A: [img=11x39]180327b5ddf0a9c.png[/img]
B: [img=20x43]180327b5e886c5f.png[/img]
C: [img=11x39]180327b5f1309a0.png[/img]
D: [img=11x39]180327b5fa9a714.png[/img]
举一反三
- 向量[img=69x25]1803494dcd8b516.png[/img]与[img=55x25]1803494dd622214.png[/img]的夹角等于 A: [img=11x39]1803494ddf57df1.png[/img] B: [img=20x43]1803494de782eb4.png[/img] C: [img=11x39]1803494def924d0.png[/img] D: [img=11x39]1803494df822829.png[/img]
- 向量[img=69x25]18037a0ed61b3e4.png[/img]与[img=55x25]18037a0ede8b28a.png[/img]的夹角等于 A: [img=11x39]18037a0ee811451.png[/img] B: [img=20x43]18037a0ef17364b.png[/img] C: [img=11x39]18037a0efa71324.png[/img] D: [img=11x39]18037a0f03006f1.png[/img]
- 向量[img=69x25]1803bb89a860aeb.png[/img]与[img=55x25]1803bb89b09c9f6.png[/img]的夹角等于 A: [img=11x39]1803bb89b92b86a.png[/img] B: [img=20x43]1803bb89c155e43.png[/img] C: [img=11x39]1803bb89c9c109d.png[/img] D: [img=11x39]1803bb89d1b250f.png[/img]
- 设f(x)为连续函数，且 [img=217x49]18034a50d8b1b92.png[/img] 则[img=70x25]18034a50e196c62.png[/img] A: 5 B: 4 C: 0 D: -5
- 已知（X,Y）的联合分布律为:[img=520x161]1803e1674fcfa1e.jpg[/img]则P(X≤0, |Y|<1)等于 A: 2/9 B: 1/3 C: 5/9 D: 5/6