{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"396e1bee-219e-4bee-9884-3214c17ff8f5","title":"人工智能时代：破解人机共存密码（套装共10册）","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787521719512","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"396e1bee-219e-4bee-9884-3214c17ff8f5","id":"396e1bee-219e-4bee-9884-3214c17ff8f5","uuid":"396e1bee-219e-4bee-9884-3214c17ff8f5","title":"人工智能时代：破解人机共存密码（套装共10册）","normalized_title":"人工智能时代破解人机共存密码套装共10册","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787521719512","isbns":["9787521719512","9787521709957","9787508685670","9787521713794","9787521703320","9787508698359","9787508673219","9787521713176","9787508668673"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":3314,"navigation_url":"https://workshop.closeclaw.top/ai/book/396e1bee-219e-4bee-9884-3214c17ff8f5","title_url":"https://workshop.closeclaw.top/ai/title/%E4%BA%BA%E5%B7%A5%E6%99%BA%E8%83%BD%E6%97%B6%E4%BB%A3%EF%BC%9A%E7%A0%B4%E8%A7%A3%E4%BA%BA%E6%9C%BA%E5%85%B1%E5%AD%98%E5%AF%86%E7%A0%81%EF%BC%88%E5%A5%97%E8%A3%85%E5%85%B110%E5%86%8C%EF%BC%89","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/396e1bee-219e-4bee-9884-3214c17ff8f5/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/396e1bee-219e-4bee-9884-3214c17ff8f5/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/396e1bee-219e-4bee-9884-3214c17ff8f5","page_url":"https://workshop.closeclaw.top/api/ai/books/396e1bee-219e-4bee-9884-3214c17ff8f5/page","search_url":"https://workshop.closeclaw.top/api/ai/books/396e1bee-219e-4bee-9884-3214c17ff8f5/search"},"page":{"printed_page":"=9","pdf_page":1123,"physical_index":1123,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"3504cb8b9ed9562d6e4e8691ea1b0c22de2a3f51c62432f37c5770d3e437d993"},"chapter":"第8章符号与符号处理","content":"这就是代数。回到第一个问题，我们想求得约翰尼的年龄，解题的关键在于如何将涉及约翰尼年龄的文字表述转换为对应的方程式。为了简洁起见，我们将约翰尼的年龄设为x：\n\n$$\nx - 2 = 7\n$$\n\n或，约翰尼的年龄减2等于7\n\n当然，这里的未知数x指代谁都已不重要。我们的目的在于，剔除不必要的细节，使已知条件更易于计算和处理。用这种方式处理问题，我们希望能够得到以下某种类型的方程：\n\n$$\nx { = } V\n$$\n\n或，约翰尼的年龄是V\n\n这里的V代表的是数字。依照我们在高中学习的知识，不需要用到太多的花样，求解过程如下：\n\n1.在等式的左右两边同时加2：\n\n$$\nx - 2 + 2 = 7 + 2\n$$\n\n2.简化左式：\n\n$$\nx - 2 + 2 \\Rightarrow x + ( - 2 + 2 ) \\Rightarrow x + 0 \\Rightarrow x\n$$\n\n3.简化右式：\n\n$$\n7 + 2 \\Rightarrow 9\n$$\n\n4.在简化后的左式和右式之间画等号：\n\n=9","previous_page":1122,"next_page":1124}