英语翻译I ______ ______you _____ before I leave home.

用一个未知数表示另一个未知数,这道题是什么意思按照这道题的题目,求解：2x+3y=7 x=______y=______5x-2y=8 x=______y=______二分之x+三分之y=2 x=______y=______4x=四分之y-2 x=______y=______ 英语翻译I have to ______ ______ ______ ______ . 英语翻译I ______ ______ _____ ______ ______ my best friend. 英语翻译i ______ go to school ______. 英语翻译I _______where Simon ______ ______ 英语翻译I am not ______ _____ ______. 英语翻译I guess they ______ ______ ______ their work. 英语翻译I’m ______ ______ _______ to England for study. 英语翻译There are many ______ ______ my brother and I. 英语翻译I have ______ ______ ________ _________ beautiful lake 英语翻译I am sorry ______ _______ you. 英语翻译I'm usually ____ ____ ______. 英语翻译I'm sorry ______ trouble you 英语翻译I am not angry with him ,______ ______ ______ jokes he ______ on me. 英语翻译I __________ him before=I ______ ______ ______ him before 英语翻译提示:I hope I can_____ ______ the moon ______ ______. 英语翻译I ______ ______you _____ before I leave home. 英语翻译He made ______ ______ mistakes as I ______ ,要求填空，