集合B={x∈R|x=4t+1/t -6,t∈(0,+∞)},求集合x的取值?
问题描述:
集合B={x∈R|x=4t+1/t -6,t∈(0,+∞)},求集合x的取值?
答
根据均值不等式:4t+1/t-6>=2*[根号下4t*(1/t)]-6=-2所以x>=-2
集合B={x∈R|x=4t+1/t -6,t∈(0,+∞)},求集合x的取值?
根据均值不等式:4t+1/t-6>=2*[根号下4t*(1/t)]-6=-2所以x>=-2