f(x)=4x+16/(x+2),(x>-2);求最小值

题目详情

▼优质解答

答案和解析

f(x)=4x+16/(x+2)=4(x+2)+16/(x+2)-8>=2√[(4(x+2)*16/(x+2)]-8=2*8-8=8
所以最小值是8
当4(x+2)=16/(x+2)时取得!

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