ta co x^2\9 +y^2\4=1
đặt x\3=sina, y\2=cosa
=> S= 6.|sina -cosa +2|
S=6.|can2.cos(a+pi\4) +2|
Smin = 6.|2-can2| khi cos(a+pi\4)=-1 hay sina-cosa = -can2 => x\3 -y\2= -can2
vay Smin = 12-6can2
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ta co x^2\9 +y^2\4=1
đặt x\3=sina, y\2=cosa
=> S= 6.|sina -cosa +2|
S=6.|can2.cos(a+pi\4) +2|
Smin = 6.|2-can2| khi cos(a+pi\4)=-1 hay sina-cosa = -can2 => x\3 -y\2= -can2
vay Smin = 12-6can2