Volterra微分方程[img=135x95]1803688d65a8af5.png[/img][img=83x23]1803688d6eb724a.png[/img]对应初值问题[img=139x25]1803688d778a22e.png[/img]的解[img=68x25]1803688d80952e0.png[/img]是周期函数，且解的周期平均值为[img=77x39]1803688d894765c.png[/img]
举一反三
- 已知函数y(x)满足方程[img=123x39]1803d34c6b26e5f.png[/img],且当x =1时,[img=56x29]1803d34c736a4ef.png[/img],则其解为( ) A: [img=65x23]1803d34c7c3d328.png[/img] B: [img=59x39]1803d34c842a306.png[/img] C: [img=74x29]1803d34c8cd1289.png[/img] D: [img=78x43]1803d34c953169e.png[/img]
- 已知随机变量X的分布函数为[img=136x49]1803b69024c8270.png[/img] ，则X的均值和方差分别为 A: E(X)=2, D(X)=4 B: E(X)=4, D(x)=2 C: [img=162x43]1803b6902cd8bfb.png[/img] D: [img=162x43]1803b69034d9ffd.png[/img]
- Which of the following propositions is false,set A = {x,x is an integer and[img=60x23]1803a1c6eebb7a3.png[/img]} ? ( ) A: [img=113x25]1803a1c6f77ce06.png[/img] B: [img=139x25]1803a1c7001fe79.png[/img] C: [img=51x22]1803a1c70863f61.png[/img] D: {x|x is an integer and |x| 4}[img=33x22]1803a1c711a7c63.png[/img]
- Which of the following propositions is false,set A = {x,x is an integer and [img=60x23]1803a1c503ffa04.png[/img]} ? ( ) A: [img=113x25]1803a1c50cc3162.png[/img] B: [img=139x25]1803a1c514e60ea.png[/img] C: [img=51x22]1803a1c51dd52ef.png[/img] D: {x|x is an integer and |x| <4} [img=33x22]1803a1c525cf1bd.png[/img]
- “不是每一个实数都是有理数”的逻辑符号化为? 设R(x):x是实数,Q(x):x是有理数。 A: [img=139x25]180366c57a727ee.png[/img] B: [img=165x25]180366c582aa48d.png[/img] C: [img=165x25]180366c58b3d1d5.png[/img] D: [img=139x25]180366c593db471.png[/img]