2022-2023七年级学生英语双语报答案，目前学生双语报答案网已经整理了2022-2023七年级学生英语双语报答案的各科答案和试卷，更多学生双语报答案请关注本网站。

【答`】Suddenly,Kayla noticed a familiar face in the crowd.She could hardly contain her excitement..“Anthony！She screamed,waving joyfully at her long lost husband.Hearing his name called,Anthony immediately hurried tothem.Meanwhile,Melanie recognized her son in an instant,who hadn't changed so much except for some wrinkleson his forehead."Thank goodness!How nice to have you come back!"She said in a trembling voice and held himtightly,tears blurring her eyes.Confused as Anthony was,he believed they were his beloved family membersmentioned by the attendant and agreed to go back home with them.Back home,Melanie and Kayla tried to restore Anthony's memory.Every day,they accompanied him to receive therehabilitation treatment in the hospital.Apart from that,they showed him their former pictures,which they hopedwould bring back his memory.One day,as they were browsing the pictures,one of them caught his eyes.It wasAnthony and his son,in which they took a trip to their old house."Mark!It's Mark!"he yelled.Happy memories ofthe past flooded into his mind.With great effort,Anthony's memory was restored.

23.证明：(1)(x+y)(x+y)=x+xy+xy+y=(x3+y2)2-2x3y3+y(x+y)…2分=1+(x+y-2x2y2)=1+xy(x2-y2)2≥1.5分(2)因为(x+y)3=x3+3x2y+3x2+y2…6分=1+3y(x+)≤1+3(x+y)(色)2=1+子(x+)月8分所以(x+y)3≤1，(x+y)≤4，x+y≤诉，当且仅当x=y时，取等号.10分