y=(x+4)(x+9)/x (x>0)用高2均值不等式解
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y=(x+4)(x+9)/x (x>0)用高2均值不等式解
y=(x+4)(x+9)/x (x>0)
用高2均值不等式解
y=(x+4)(x+9)/x (x>0)用高2均值不等式解
y=(x^2+13x+36)/x=x+36/x+13>=2根号(x*36/x)+13=25