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If x and y are positive R, 2 / x + 1 / y = 1, then the minimum value of X + 2Y is I know how to do it. Find the easiest one I'm 2Y + x = XY Then use the basic inequality to do
x+2y=（2/x+1/y）（x+2y）=4+（4y/x+x/y）>=8
If and only if 4Y / x = x / y, that is, x = 4, y = 2, take the equal sign
You can't take the equal sign at the same time
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