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世界上一切事物总是在不断运动和变化着,而在运动变化中,常常有着相对“静止”的状态或“不变性”的情形,我们将事物在运动变化中保特的“不变性”称作“守恒”。小学数学中蕴含着许多守恒问题,譬如,五大运算定律在整数、小数、分数的运算中是守恒的。分数的基本性质保证了分数值的不变性,从而在分数形式上可作多种变化,并使约分和通分成为有意义的运算。不管圆变得多大或多小,它的
Everything in the world is constantly moving and changing. In the course of changing movements, there are often relatively “still” states or “invariances.” We call the “invariance” of things in motion changes For “conservation.” Primary school mathematics contains many conservation issues, for example, the five major laws of arithmetic in the integer, decimal, fractional operation is conserved. The basic nature of the scores guarantees the invariance of the fractional values so that many variations can be made in the fractional form and the approximations and splits can be made into meaningful computations. It does not matter how big or small it is