差分方程简介 以t表示时间,规定t只取非负整数。t=0表示第一周期初, t=1表示第二周期初等。记y为变量y在时刻t时的取值,则 称43为y的一阶差分,称为的二阶差分。类似地,可以定义y的m阶差分。 由ty1及y的差分给出的方程称为y1差分方程,其中含的最 高阶差分的阶数称为该差分方程的阶。差分方程也可以写成不显含差分的形式

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.导学案

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.教案(1)

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.导学案(2)

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.导学案(1)

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.教案(2)

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.教案(4)

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.教案

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.课件(3)

外研版（三起）（2012）小学英语三年级下册Module 3 Unit 2 I don't like riding my bike.Module 3 Unit 2 I don't like riding my bike.课件(5)