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从孩提时代开始,我们最初接触的数字就是1,从小学最开始的最小正整数1,到初中时代的1次幂,再到高中时代的1,当然高中时代接触到的1的运用就较多了,如单位长度、单位圆、单位向量,指对函数中经常借助于1来比较大小,三角函数中同角三角函数的关系中的平方关系:sin~2α+cos~2α=1,再如平面向量中三点共线中的1,不等式中1的合理运用等等,甚至到大学数学中1的运用也是无处不在。
From childhood, the number we initially contacted was 1, from the smallest positive integer 1 in the beginning of elementary school to the power of 1 in junior middle school to 1 in high school, of course, 1 was used more frequently in high school , Such as unit length, unit circle, unit vector, refers to the function of often by means of 1 to compare the size, the trigonometric function of the relationship with the trigonometric trigonometric function of the square relationship: sin ~ 2α + cos ~ 2α = 1, 1 in the three-point collinearity in the plane vector, the rational use of 1 in the inequality and so on. Even the application of 1 in university mathematics is ubiquitous.