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球员投出的球的轨迹由 h(d) = -0.1 d^2 + d + 1 (m)描述, d 为水平距离。(a) 达到的最大高度?(b) 球落地的位置?
球员投出的球的轨迹由 h(d) = -0.1 d^2 + d + 1 (m)描述, d 为水平距离。(a) 达到的最大高度?(b) 球落地的位置?
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