设f(x) = ax + b
f[f(x)] = a(ax+b)+b = a^2x + ab+b = 16x+25
所以 a^2 = 16,ab+b = 25
当a=4时,b(a+1) = 25,b = 5,解析式 f(x) = 4x + 5
当a=-4时,b(a+1) = 25,b = -25/3,解析式 f(x) = -4x - 25/3
如果满意请点击右上角评价点【满意】即可~
设f(x) = ax + b
f[f(x)] = a(ax+b)+b = a^2x + ab+b = 16x+25
所以 a^2 = 16,ab+b = 25
当a=4时,b(a+1) = 25,b = 5,解析式 f(x) = 4x + 5
当a=-4时,b(a+1) = 25,b = -25/3,解析式 f(x) = -4x - 25/3
如果满意请点击右上角评价点【满意】即可~