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[学习目标预设]:1.借助数轴理解相反数的概念,知道互为相反数的一对数在数轴上的位置关系。2.会求一个有理数的相反数。3.能根据相反数的意义进行多重符号的化简。4.经历从实际中抽出数学模型,从数形结合两个侧面理解问题,并能选择处理数学信息,做出大胆猜测,判断,发展形象思维。5.积极参与数学学习活动,在自学中对学习充满求知欲,在活动中体验成功的喜悦。[学习重点与难点]:1.重点:理解相反数的意义,理解相反数的代数意义与几何意义的一致性。2.难点:双重符号的化简。[探索求知—我耕耘]:
[Learning Objectives Preset]: 1. Understand the concept of opposite numbers with the help of several axes and know the positional relationship of a pair of opposite numbers to each other on the axis. 2. Will seek the opposite of a rational number. 3. According to the meaning of the opposite number of multiple sign simplification. 4. Experiencing the mathematical model drawn from reality, from two sides to understand the problem from the number and form, and can choose to deal with mathematical information, make bold guesses, judgments, the development of image thinking. 5. Actively participate in math learning activities, self-learning is full of curiosity, experience the joy of success at the event. [Learning points and difficulties]: 1. Focus: Understand the meaning of the opposite number, understand the algebraic meaning of the opposite number and the geometric meaning of consistency. 2. Difficulties: the simplification of the double symbol. [To seek knowledge - I work hard]: