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Application of Mathematical Quadratic Function in Grade Three: A male volleyball player stands in the service court to serve. . .
Solution:
(1) Substitute x= 18 into the quadratic function. ，y ≈- 14.27，
② According to the vertex formula, X max =b\-2a∴x max =2.5. Y=3.75 at this time. When the horizontal distance is 2.5 meters, volleyball is the highest.