一次函数y=kx+b(k、b是常数,k≠0),其自变量x的取值范围是全体实数,图象是一条直线,因而没有最大值和最小值;但当m≤x≤n时,则一次函数的图象是一条线段。根据函数的性质,就有最大值和最小值。在生产实际、市场经济中的利润、方案决策等方面的最值问题,密切联系实际,是生活、经 The first-order function y = kx + b (k, b is a constant, k ≠ 0), the range of its argument x is all real numbers, the image is a straight line, so there is no maximum and minimum; but when m ≤ x When ≤ n, the image of the primary function is a line segment. According to the nature of the function, there are maximum and minimum values. In the actual production, profit in the market economy, program decision-making and other aspects of the most value issues, closely linked with reality, is life, by