2.3连续型随机变量 一、连续型rv的概念 定义设是随机变量,若存在一个非负可积函数(x),使得 其中F(x)是它的分布函数则称x是连续型rv,f(x)是它的概率 密度函数(p.d.f.),简记为df

由微积分学基本定理,当f(x)在[a,b]上连续时,存在原函数F(x) 由 NewtonLeibnitsI-式if(x)df()-F(a) 有时用上面的方法计算定积分有困难

第六章常微分方程 附加条件 y(a)=yu,y(b)=y2 称为边值条件( boundary condition) 满足微分方程,并且适合定解条件的解称为微分方程的特解 (special solution) 微分方程的存在唯一性定理 存在唯一性定理:对一阶初值问题:=f(xy ,若二元函数 y(x0) f(x,y)在矩形D={(x,y):x-x0Ay-y0B}连续, 且偏导数(xy存在并有界则存在正数h,使得上述初值问题 在区间[x。-h,x+h上存在有唯一的解 证明思路:

2-3图示翻罐笼由滚轮A、B支承,已知翻罐笼连同煤车共重 W=3kN,a=30°,B=45°。求滚轮A、B所承受的压力。有人认为 F=Wcos,FB=Wcosβ,对不对,为什么? 解:翻罐笼受力如图所示。建立图 示坐标系,列平衡方程 联解方程,得 F155N

一、平面曲线弧长 (1)曲线:y=f(x) asxsb=f+fx (2) =x(t) =y(t) astsB s=x'2()+()dt (3) r=r(e) asess s=()+()de 例求下类平面曲线的弧长

Chapter F2 Power notes Analyzing Transactions Learning objectives 1. Usefulness of an Account 2. Characteristics of an Account 3. Analyzing and Summarizing Transactions 4. Illustration of Analyzing and Summarizing 5. Trial Balance 6. Discovery and Correction of Errors 7. Financial Analysis and Interpretation

Chapter F4 Power notes Completing the Accounting Cycle Learning Objectives 1. Work sheet 2. Financial Statements 3. Adjusting and Closing Entries 4. Accounting Cycle 5. Fiscal year 6. Financial Analysis and Interpretation

Chapter F8 Power notes Inventories Learning Objectives 1. Internal Control of inventories 2. Effect of Inventory Errors 3. Inventory Cost Flow Assumptions 4. Perpetual Inventory Costing Methods 5. Periodic Inventory Costing Methods 6. Comparing Inventory Costing Methods 7. Inventory Valuation Other Than Cost 8. Balance sheet Presentation of merchandise 9. Estimating Inventory Cost 10. Financial Analysis and Interpretation

Chapter F9 Power notes Fixed Assets and Intangible Assets Learning objectives 1. Nature of Fixed Assets 2. Accounting for Depreciation 3. Capital and Revenue Expenditures 4. Disposal of Fixed Assets 5. Leasing Fixed Assets 6. Internal Control of fixed assets 7 Natural resources 8. Intangible Assets 9. Financial Reporting 10. Financial Analysis and Interpretation

Chapter F7 Power notes Receivables Learning objectives 1. Classification of receivables 2. Internal Control of receivables 3. Uncollectible receivables 4. Uncollectibles- Allowance Method 5. Uncollectibles- Direct Write-Off Method 6. Characteristics of notes receivable 7. Accounting for Notes Receivable 8. Balance Sheet Presentation 9. Financial Analysis and Interpretation