题目内容：

用一根120厘米的绳子围成面积为675的长方形怎么求长和宽

优质解答

x * (120/2 - x) = 675 ==> x * (60 - x) = 675 ==> x^2 - 60x + 675 = 0 ==> (x -15)(x - 45) = 0 ==> x = 15, or 45 长45 和 宽 15