已知实数x y满足x-2y=3,则根号x2+y2最值是多少?

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已知实数xy满足x-2y=3,则根号x2+y2最值是多少?已知实数xy满足x-2y=3,则根号x2+y2最值是多少?已知实数xy满足x-2y=3,则根号x2+y2最值是多少?x-2y=3x=2y+3x

已知实数x y满足x-2y=3,则根号x2+y2最值是多少?
已知实数x y满足x-2y=3,则根号x2+y2最值是多少?

已知实数x y满足x-2y=3,则根号x2+y2最值是多少?
x-2y=3
x=2y+3
x²+y²
=(2y+3)²+y²
=5y²+12y+9
=5(y²+12y/5+36/25)+9/5
=5(x+6/5)²+9/5
最小值:y=9/5

大于等于9

此题是求直线x-2y=3到原点的最值的变形。具体解答过程我就不说了

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