Question

已知函数f(x)=x+1,g(x)由下表给出,则方程f(g(x))=的解集为 x 1 2 3 4 5 g(x) 2 1

Answer 1

f(g(x))=g(x)+1

x 1,2,3,4,5

f(g(x)) 3,2,5,4,6