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the English examination I would have gone
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最小值,正数,题目
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the English examination I would have gone
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题目若正数x,y满足x+3y=5xy,则3x+4y的最小值可圈可点用户2021-02-22 08:44优质解答答案：解：x+3y=5xy1/y+3/x=53x+4Y=1/5(3x+4y)(1/y+3/x)=1/5[13+3x/y+12y/x
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题目
若正数x,y满足x+3y=5xy,则3x+4y的最小值
可圈可点用户
2021-02-22 08:44
优质解答
解：x+3y=5xy
1/y+3/x=5
3x+4Y
=1/5(3x+4y)(1/y+3/x)
=1/5[13+3x/y+12y/x]
≥1/5[13+2√(3x/y*12y/x)]
≥1/5*(13+12)
≥5
3x+4Y的最小值是5
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