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模仿是人们在生活中最基本的活动之一.在人生的道路上,模仿并不是低能的举动,青胜于蓝,必先出于蓝;要发展,必先继承;图创新,必先模仿.模仿是创新的阶梯.因此,模仿是不可避免的,却会随创新能力的增强而逐渐减少.我们在学习和运用数学模型方法时,就少不了模仿能力的训练和培养.数学模型有许多:非负数(式)模型、替代模型、配偶式模型、加0乘1模型、函数模型…….本文介绍了非负数(式)模型.在实数范围内,正数和零统称非负数.在初中我们学习了三种非负数(式):绝对值|a|,算术平方根2~a/2,平方数a2(包括方差的计算公式),非负数中的最小值为零;有限个非负数之和仍然是非负数,若有限个非负数的和为零,则各个非负数同时为零.这些均是非负数模型的重要特性.
Imitation is one of the most basic activities of people in life. In the path of life, imitation is not a low-energy act. Green is better than blue and must first be blue; if it is to develop, it must be inherited first; Imitation is the ladder of innovation. Therefore, imitation is unavoidable, but it will gradually decrease with the increase of innovation ability. When we learn and use mathematical model methods, we will miss the training and cultivation of imitation skills. There are many mathematical models: Non-negative (formula) models, surrogate models, spouse models, plus 0 times 1 models, function models.... This paper introduces non-negative number models. In the real range, positive numbers and zero families are called non-negative numbers. We have studied three kinds of non-negative numbers: Absolute value |a|, arithmetic square root 2~a/2, square number a2 (including the calculation formula of variance), the minimum value in non-negative number is zero, and a finite number of non-negative numbers The sum is still non-negative. If the sum of a finite number of non-negative numbers is zero, then each non-negative number is zero at the same time. These are all important characteristics of the non-negative number model.