焦作市第二十五中学杨艳丽123456780–1–2–3–4–512349105在直角坐标系中描出以下各点：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用线段依次连接，看一看是什么图案。yx第3节变化的鱼123456780–1–2–3–4–512349105图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的yx纵坐标保持不变，将各坐标的横坐标加3则坐标变化为原图形被向右平移3个单位(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x+3,y)(3,0)(8,4)(6,0)(8,1)(8,-1)(6,0)(7,-2)(3,0)图形有什么变化吗？(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x+2,y+2)(2,2)(7,6)(5,2)(7,3)(7,1)(5,2)(6,0)(2,2)布置任务：将上面鱼的顶点(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)进行如下变化：1、纵坐标保持不变，将各坐标的横坐标减２，图案会变成什么样？2、横坐标保持不变，将各坐标的纵坐标都加２，则原图型变为什么样？3、横坐标保持不变，将各坐标的纵坐标都减2，则原图型变为什么样？4、横坐标分别加2，纵坐标分别加2，所得到的鱼与原来的鱼相比又有什么变化呢？123456780–1–2–3–4–512349105图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的纵坐标保持不变，将各坐标的横坐标减２，图案会变成什么样？yx-1-2原图形被向左平移2个单位123456780–1–2–3–4–512345图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的横坐标保持不变，将各坐标的纵坐标都加２，则原图型变为什么样？yx原图形被向上平移2个单位123456780–1–2–3–4–512345图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的横坐标保持不变，将各坐标的纵坐标都减2，则原图型变为什么样？yx原图形被向下平移2个单位123456780–1–2–3–4–512349105yx将原来的鱼的顶点的横坐标分别加2，纵坐标分别加2，所得到的鱼与原来的鱼相比又有什么变化呢？123456780–1–2–3–4–512349105yx图中蓝色的鱼是由红色的鱼与怎样变化而得到的？(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x′,y′)它们对应顶点的坐标有什么样的关系？蓝色鱼的坐标是：(3,-2)(8,2)(6,-2)(8,-1)(8,-3)(6,-2)(7,-4)(3,-2)123456780–1–2–3–4–512349105在直角坐标系中描出以下各点：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)并用线段依次连接,看一看是什么图案.yx图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的纵坐标保持不变，将各坐标的横坐标变成原来的２倍会得到什么？则坐标变化为：原图形被横向拉伸2倍(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(2x,y)(0,0)(10,4)(6,0)(10,1)(10,-1）(6,0)(8,-2)(0,0)123456780–1–2–3–4–512349105图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的纵坐标保持不变,将各坐标的横坐标变成原来的1/2，图形会怎么变？则坐标变化为：yx原图形被横向压缩1/2(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(x/2,y)(0,0)(2.5,4)(1.5,0)(2.5,1)(2.5,-1)(1.5,0)(2,-2)(0,0)–4123456780–1–2–361234578910xy图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的如果横坐标保持不变，纵坐标变成原来的２倍，那么所得图案又会发生什么变化?原图形被纵向拉伸２倍–4123456780–1–2–361234578910xy图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的如果横坐标保持不变，纵坐标变成原来的½，那么所得图案又会发生什么变化?原图形被纵向压缩1/2原图形被横向、纵向各拉伸2倍123456780–1–2–361234578910xy–41.图中的鱼是将坐标为：(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)的点用线段依次连接而成的如果横坐标与纵坐标同时乘以２原坐标变为：(x,y)(0,0)(5,4)(3,0)(5,1)(5,-1)(3,0)(4,-2)(0,0)(2x,2y)那么所得图案又会发生什么变化?(0,0)(10,8)(6,0)(10,2)(10,-2)(6,0)(8,...
