用坐标表示平移课后练习题A′B′C′D′A(-1,-2)B(3,-2)C(4,1)D(0,1)顺口溜:右加左减,“x”加减上加下减,“y”加减A′B′C′D′横坐标减2,纵坐标加3(-3,1)(1,1)(2,4)(-2,4)P(-1,1)Q(-3,1)R(-1,-1)P′(4,3)Q′(2,3)R′(4,1)横坐标加5,纵坐标加2向右平移5个单位,在向上平移2个单位··Q′R′A(-3,2)B(-3,-2)C(3,-2)D(3,2)A′(-5,2)B′(-5,-2)C′(1,-2)D′(1,2)向左平移2个→横坐标减2向上平移3个→纵坐标加3顺口溜:右加左减,“x”加减上加下减,“y”加减A″(-5,5)B″(-5,1)C″(1,1)D″(1,5)顺口溜:右加左减,“x”加减上加下减,“y”加减(-4,-1)(1,1)(-1,4)向右平移2个单位,在向上平移3个单位↓↓横坐标加2纵坐标加3(-2,2)(3,4)(1,7)C横坐标加5→向右平移5个单位纵坐标加3→向上平移3个单位顺口溜:右加左减,“x”加减上加下减,“y”加减A(-2,3)B(-4,-1)C(2,0)A1(3,6)B1(1,2)C1(7,3)DEFOEBDABAFOOEDFAOBSSSSS△△△长方形△解:--262142214221461064424··A(2,3)C(2,-3)(2,3)C(2,-3)··点A和点C的横坐标不变纵坐标互为相反数M(x,y)→N(x,-y)关于x轴对称:横不变,纵相反关于y轴对称:纵不变,横向反关于原点对称:横纵都变相反