设[img=13x19]18030f9d28af398.png[/img]由曲面[img=127x26]18030f9d31474c3.png[/img]所围且在第一卦限部分，则[img=184x48]18030f9d3b70b24.png[/img]等于
A: [img=31x43]18030f9d44a5339.png[/img]
B: [img=31x43]18030f9d4d1eefb.png[/img]
C: [img=22x43]18030f9d5655f99.png[/img]
D: [img=31x43]18030f9d5df4f9b.png[/img]
E: [img=31x43]18030f9d6568467.png[/img]
F: [img=31x43]18030f9d6e76818.png[/img]
G: [img=31x43]18030f9d78073ac.png[/img]
A: [img=31x43]18030f9d44a5339.png[/img]
B: [img=31x43]18030f9d4d1eefb.png[/img]
C: [img=22x43]18030f9d5655f99.png[/img]
D: [img=31x43]18030f9d5df4f9b.png[/img]
E: [img=31x43]18030f9d6568467.png[/img]
F: [img=31x43]18030f9d6e76818.png[/img]
G: [img=31x43]18030f9d78073ac.png[/img]
举一反三
- 设[img=13x19]180322abc778b73.png[/img]由曲面[img=127x26]180322abcfd0ed0.png[/img]所围且在第一卦限部分，则[img=184x48]180322abdaea1f0.png[/img]等于 A: [img=31x43]180322abe37d47b.png[/img] B: [img=31x43]180322abeb57d34.png[/img] C: [img=22x43]180322abf3448fc.png[/img] D: [img=31x43]180322abfc36a0f.png[/img] E: [img=31x43]180322ac0493c62.png[/img] F: [img=31x43]180322ac0d431c2.png[/img] G: [img=31x43]180322ac16e11a8.png[/img]
- 设[img=13x19]1803c1ee1b8e4ad.png[/img]由曲面[img=127x26]1803c1ee233c858.png[/img]所围且在第一卦限部分，则[img=184x48]1803c1ee2cd1fe6.png[/img]等于 A: [img=31x43]1803c1ee3562d50.png[/img] B: [img=31x43]1803c1ee3e5238b.png[/img] C: [img=22x43]1803c1ee47480de.png[/img] D: [img=31x43]1803c1ee500b748.png[/img] E: [img=31x43]1803c1ee579168c.png[/img] F: [img=31x43]1803c1ee5fa4e2e.png[/img] G: [img=31x43]1803c1ee678913e.png[/img]
- 设[img=13x19]1803857615a88c3.png[/img]由曲面[img=127x26]180385761e3e492.png[/img]所围且在第一卦限部分，则[img=184x48]1803857629bd92c.png[/img]等于 A: [img=31x43]180385763298f01.png[/img] B: [img=31x43]180385763b8754b.png[/img] C: [img=22x43]1803857643aedfa.png[/img] D: [img=31x43]180385764b1e960.png[/img] E: [img=31x43]1803857653f232e.png[/img] F: [img=31x43]180385765c3fa49.png[/img] G: [img=31x43]1803857675b3624.png[/img]
- 设随机变量X 和Y相互独立且都服从正态分布[img=61x27]180387e11b2d7af.png[/img]，而[img=85x23]180387e123ff847.png[/img]和[img=76x23]180387e12c35f4e.png[/img]分别是来自总体X和Y简单随机样本，则统计量[img=136x51]180387e134c69e8.png[/img]服从的分布是( ) A: F(9, 9) B: t(9) C: F(1, 9) D: F(9, 1)
- 设随机变量X 和Y相互独立且都服从正态分布[img=61x27]180390b43a319ba.png[/img]，而[img=85x23]180390b44248a66.png[/img]和[img=76x23]180390b44a902cc.png[/img]分别是来自总体X和Y简单随机样本，则统计量[img=136x51]180390b4539ab5f.png[/img]服从的分布是( ) A: F(9, 9) B: t(9) C: F(1, 9) D: F(9, 1)