答：h=(1/12)s^2+(2/3)s+3/2是开口向上的抛物线,与羽毛球轨迹是开口向下的抛物线矛盾,请检查题目h=-(1/12)s^2+(2/3)s+3/2=-(1/12)(s^2-8s+16)+17/6=-(1/12)(s-4)^2+17/6s=m>5时：h=-(1/12)m^2+(2/3)m+3/2>4/9-(1/12)...抱歉，是-十二分之一s平方答：h=-(1/12)s^2+(2/3)s+3/2=-(1/12)(s^2-8s+16)+17/6=-(1/12)(s-4)^2+17/6s=m>5时：h=-(1/12)m^2+(2/3)m+3/2>4/9-(1/12)(m-4)^2+17/6>4/9(1/12)(m-4)^2<43/18(m-4)^2<86/3m<4+√(86/3)所以：5
推荐
猜你喜欢
