若非零向量a,b满足关系式[img=97x25]1803d3584394ea7.png[/img],则必有( )
A: a - b = a + b
B: a = b
C: [img=46x19]1803d3584c686bc.png[/img]
D: [img=55x21]1803d358557807f.png[/img]
A: a - b = a + b
B: a = b
C: [img=46x19]1803d3584c686bc.png[/img]
D: [img=55x21]1803d358557807f.png[/img]
举一反三
- 若非零向量a,b满足关系式[img=97x25]1803d3584394ea7.png[/img],则必有( ) 未知类型：{'options': ['a - b = a + b', 'a = b', '', ''], 'type': 102}
- 若连续函数f(x)满足关系式[img=204x52]1803d34dc984a24.png[/img],则f(x)等于( ) A: [img=45x19]1803d34dd241f35.png[/img] B: [img=51x22]1803d34ddaea893.png[/img] C: [img=65x21]1803d34de2dc843.png[/img] D: [img=71x24]1803d34deb71092.png[/img]
- 若连续函数f(x)满足关系式[img=174x51]1802fb21a36505e.png[/img]，则f(x)等于 A: [img=42x19]1802fb21aba009e.png[/img] B: [img=48x22]1802fb21b447a7f.png[/img] C: [img=56x21]1802fb21bd274f7.png[/img] D: [img=62x24]1802fb21c57bba0.png[/img]
- 设F(x)和f(x)分别为某随机变量的分布函数和概率密度,则必有 A: f(x)单调不减 B: [img=121x41]1803b3ba625d2f6.png[/img] C: [img=94x26]1803b3ba6a14678.png[/img] D: [img=166x46]1803b3ba74ccb0b.png[/img]
- 设随机变量X的概率密度为f(x)，则f(x)一定满足( ). A: 0≤f(x)≤1 B: [img=183x53]1803b451bb3373a.png[/img] C: [img=133x51]1803b451c807078.png[/img] D: f(+∞)=1