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“有理数”一章是初中阶段数学学习的起始内容,也是与小学数学联系最密切,又极富挑战性的学习内容。不仅涉及数的扩张,还引入数轴、绝对值、相反数的概念,其中“绝对值”概念的引入,使有理数的运算转化为学生熟悉的小学算术数的运算成为可能,“相反数”概念的引入,使有理数的减法转化为加法成为可能。其次是符号问题,这在小学未曾涉及的,正因为这样,在学习“有理数加法”的初期,90%以上的学生都不同程度地在符号问题上出现
“Rational Number ” chapter is the beginning of the junior high school mathematics learning, but also with the primary school mathematics most closely linked, but also very challenging learning content. Not only involves the expansion of number, but also introduces the concepts of number axis, absolute value and opposite number. The introduction of the concept of “absolute value ” makes it possible to convert the operation of rational number into the familiar arithmetic of primary school pupils. “ ”Concept, it is possible to convert the subtraction of rational numbers into addition. Followed by the symbolic problem, which is not involved in the primary school, because of this, in the early days of learning “rational number addition ”, more than 90% of students appear in different degrees on the symbolic issues