SAT备考 - 每日一题（72）指数函数应用题：金门大桥的桥墩高度

[72]再来一道指数级增减应用题：旧金山金门大桥的高度 这类题被称为满分路上的绊脚石。题目看起来非常复杂，但是解题方法超级简单! h(x) = 0.000371(x^2 – 1280x) + 152 The Golden Gate Bridge is a suspension bridge that consists of two cables hung from two towers of equal height that are 1280 meters apart. The function models h, the height of each cable above the ground in meters, as it relates to x, the cable’s horizontal distance from the left tower in meters. What is the height of the towers in meters? 金门大桥是一座悬索桥，由两座等高的桥墩（塔楼）悬挂着钢索，桥墩的跨距为1280米。以上函数模拟了钢索距离地面的高度h，与钢索与左边桥墩的水平距离x（以米为单位）这两者之间的关系。请问：桥墩的高度是多少米？ 题目中的数据都是旧金山金门大桥的实际数据。 Horizontal distance 平面距离/直线距离