已知x₁，x₂是一元二次方程x²-4x+1=0的两个实数根，则x₁x₂-x₁-x₂的值等于（　　）

My father's day

    My father is a teacher. He teaches Chinese. He likes his job and his students. And the students like him too. He goes to work from Monday to Friday. He does not work on Saturday and Sunday. Every day, he gets up at five thirty. At six, he has breakfast. Then he goes running. He goes to school at seven. He has lunch at school. He goes home at five in the afternoon. At six o'clock, he has dinner. He doesn't watch TV. He likes reading（读）books with me. He goes to bed at nine thirty.

  阅读诗词，回答相关问题。

                                                                                        题李凝幽居
                                                                                             贾岛
                                                                               闲居少邻并，草径入荒园。

                                                                               鸟宿池边树，僧敲月下门。
                                                                               过桥分野色，移石动云根。

                                                                               暂去还来此，幽期不负言。

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