图示截面对x,y轴的惯性积为：[img=578x479]18034a1efafcb97.png[/img]
A: [img=127x30]18034a1f0345cf7.png[/img]
B: [img=142x42]18034a1f0b82b08.png[/img]
C: [img=133x32]18034a1f1444d52.png[/img]
D: [img=107x48]18034a1f1cf40f8.png[/img]
A: [img=127x30]18034a1f0345cf7.png[/img]
B: [img=142x42]18034a1f0b82b08.png[/img]
C: [img=133x32]18034a1f1444d52.png[/img]
D: [img=107x48]18034a1f1cf40f8.png[/img]
举一反三
- 图示截面对x,y轴的惯性积是：[img=578x479]1802f41b3c15bb7.png[/img] A: [img=127x30]1802f41b44a5c0d.png[/img] B: [img=142x42]1802f41b4cdc4dc.png[/img] C: [img=133x32]1802f41b566b8b8.png[/img] D: [img=107x48]1802f41b5ecd45e.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
- 可导函数f(x)，对任意的x,y恒有f(x+y)=f(x)f(y)，且f'(0)=1,则f(x)等于 A: [img=60x19]1802fb229b3bc18.png[/img] B: [img=55x46]1802fb22a3b7107.png[/img] C: [img=17x19]1802fb22abf3c5e.png[/img] D: [img=49x23]1802fb22b545827.png[/img]
- 函数[img=73x26]1803467b5e85eef.png[/img]的极值为（ ）. A: f(0)=1 B: f(1)=2 C: x=0 D: x=1
- 设[img=143x35]1803b3baa24b1c3.png[/img]，其密度函数为f(x)，分布函数为F(x)，则 A: P(X<0)=P(X>0) B: P(X<1)=P(X>1) C: F(−x)=1−F(x) D: f(−x)=f(x)