2.1. 一袋装有5只球，编号为1，2，3，4，5 .在袋中同时取3只球，以X表示取出的3只球中的最大号码，写出随机变量X的概率分布

1.利用对角线法则计算下列三阶行列式: 解(1)1-4-1=2x(-4×3+0×(-1x(-1)+1×1×8

Problem Set 3 Prof. Gene Chang (For Ph. D students, due on Dec. 28th in the class, or TA's office. For M.A. students, due on Dec. 26th, in the class or TA's office. Late turn-in may result in a penalty in the grade) 1. Kland is a Robinson Crusoe type economy. Robinson, as the consumer and the owner of the firm, has the utility function U(x,) =aIn x+ BInI, where is leisure. Robinson's endowment

Problem Set 1 Prof. Gene Chang Due on Dec.5 5th in the class,orta' 's office(经院220室) Late turn-in may result in a penalty in the grade 1. The consumption set is={x X E}. Suppose the utility function representing the preference

型推论1:如果函数f(x)在区间/上的导数恒为零,那末f(x)在区间上是一个常数

1. 长 l 的梁用绳向上吊起，如图所示。钢绳绑扎处离梁端部的距离为 x。梁内由 自重引起的最大弯矩|M|max 为最小时的 x 值为：