To solve the quadratic equation 4x^2 + 5x + 1 = 0 using the cross-multiplication method, we need to find two numbers whose product is equal to 4 * 1 = 4 (coefficient of x^2 times the constant term) and whose sum is equal to the coefficient of x (5). The numbers that satisfy these conditions are 4 and 1. Next, we rewrite the quadratic equation as: 4x^2 + 4x + x + 1 = 0 Now we group the terms together: (4x^2 + 4x) + (x + 1) = 0 Next, we factor out the common factors from each group: 4x(x + 1) + 1(x + 1) = 0 Now, we can see that we have a common factor of (x + 1): (x + 1)(4x + 1) = 0 Now, we set each factor equal to zero and solve for x: x + 1 = 0 or 4x + 1 = 0 Solving the first equation, x + 1 = 0, gives x = -1. Solving the second equation, 4x + 1 = 0, gives x = -1/4. Therefore, the solutions to the quadratic equation are x = -1 and x = -1/4.
眼睛比较好 随着年龄的增长，人的视力可能会逐渐下降，这是由于眼球晶状体弹性减低、眼肌力量减弱等原因所致。, “在这样的背景下，胃癌的早筛无疑相当重要。
沙漠西瓜不能摘，不听劝的游客刚摘下为何就后悔了呢？
沙漠西瓜是一种虚拟的概念，实际上并不存在。因此，游客不听劝告而摘下了所谓的沙漠西瓜后，会立即后悔，因为他们会意识到自己被愚弄了，摘下的东西并非真正的西瓜，而是欺骗他们的虚假物品。
雀巢N³亲体奶系列产品全球首发 “我们由衷地期待，并且也很有信心，雀巢N³亲体奶将为中国消费者带来前所未有的变革性饮奶体验，让乳糖吸收不良和肠胃敏感人群，都能无忧无虑地享受牛奶的营养与美味。,“三山”防空洞俨然成为国防教育动员和党史的生动教材和实景课堂。
成吉思汗后代的姓氏是什么？
成吉思汗的后代大多以姓氏"娜木真"为姓，但其中也有以"博尔济"、"泰赤"等姓氏为家族姓氏的后代。
对此农业组一方面粉碎、疏松结块土壤，在田间挖通排水渠，改变地下水排泄方式，有效遏制地表盐渍化；,持续加大执法检查力度，从严查处涉渔“三无”船舶、渔船非法载客、养殖渔船超载、渔船安全设备配备不齐、船员配备不合格以及渔民临水作业不穿救生衣等违法违规行为，保持严格执法的高压态势。
