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4x²+5x+1=0十字相乘法？ 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.事实上越是狡诈的人越是谨慎，尤其在手握8000万的情况下，温莉不可能轻易冒这么大的风险。 因为陈硕为了打赢官司会用不少手段，所以罗英子称呼他为陈无良，为了金钱什么不管不顾，可陈硕真的是这样的人吗？银行的视频是他费尽心思透露给罗英子的，罗英子卖车的时候，也是他帮了忙，让罗英子能卖出更高的价格，陈硕对罗英子的执着还是欣赏的，不过慢慢的这种欣赏就成为了喜欢，陈硕对自己的心意从不藏着掖着，甚至有时候还会撩一下罗英子。