向量代数 一、向量的概念 向量:既有大小又有方向的量 向量表示:a或M1M2 以M1为起点,M2为终点的有向线段

课堂练习如图,波沿-x方向传播,0M=2m,M点的振 动方程:y=10cos(t+),u=2m/s,求波动方程 (即波函数)

海洋环境 地球表面积5100000m2,其中70.84%被海洋所覆盖; 海洋面积中84%的水深超过2000m,平均深度3800m; 真光层(阳光所能到达的深度)即便是在最清洁的水中,其深度也不会超过200m

An interesting property of an M/M/ 1 queue, which greatly simplifies combining these queues into a network, is the surprising fact that the output of an M/M/ queue with arrival rate is a Poisson process of rate This is part of Burke's theorem, which follows from reversibility A Markov chain has the property that P[future present, past] P[future present] Conditional on the present state, future states and past states are independent

1、设f(x)=,在[-1,1上求f(x)的一次最佳一致逼近多项式。 2、设f(x)∈Ca,b]试证明:f(x)的零次最佳一致逼近多项式p(x)=(M+m),其中M,m 分别为f(x)在[a,b]上的最大值和最小值

3-1:按定义:m(naCl)=(2058.44)10002001.7112(mol-kg-) x(NaC)=(20/58.44)(0/58.44+200/18.026)=0.02992 3-4:△t=km,0.81=2.53m,m=0.32016=(0.324/M)×(1000/4)