图象是以(α,f(α))和(β,f(β))为端点,以(-(b_i)/(k_i),f(-(b_i/(k_i))(i=1,2,…,x,α<-(b_1)/(k_1)<-(b_2)/(k_2)…<-(b_n)/(k_n)<β)依次为折点的折线函数,其表达式可以写成 y=f(x)=sum from i=1 to n(a_i)|k_ix+b_i| (k_i>0)由折线段的单调性,可知f(x)在[α,β]上的最大、小值 The images are (α,f(α)) and (β,f(β)) as endpoints, and (-(b_i)/(k_i),f(-(b_i/(k_i)) (i=1, 2,...,x,α<-(b_1)/(k_1)<-(b_2)/(k_2)...<-(b_n)/(k_n)<β) A polyline function that is a vertex in turn, and its expression can be Write y=f(x)=sum from i=1 to n(a_i)|k_ix+b_i| (k_i>0) From the monotonicity of the polyline, we know that f(x) is the largest on [α,β]. Small value