Answers

(1)
x²-4x+1=0 の解を‪α‬、β(‪α‬<β)とした時
0≦x≦‪α‬、β≦xの時
x²-4x+1=1
‪α‬<x<βの時
-x²+4x-1=1

それぞれ解く

(2),(3)はf(x)のグラフを書けばすぐにわかると思います

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