若x.y属于R,且满足(X*X+Y*Y+2)(X*X+Y*Y-1)-18≤0.求证:XY≤2

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若x.y属于R,且满足(X*X+Y*Y+2)(X*X+Y*Y-1)-18≤0.求证:XY≤2
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若x.y属于R,且满足(X*X+Y*Y+2)(X*X+Y*Y-1)-18≤0.求证:XY≤2
若x.y属于R,且满足(X*X+Y*Y+2)(X*X+Y*Y-1)-18≤0.求证:XY≤2

若x.y属于R,且满足(X*X+Y*Y+2)(X*X+Y*Y-1)-18≤0.求证:XY≤2
是乘的话(为什么不写成x^2?),
把(x^2+y^2)看成一整体,解不等式,得-5=x^2+y^2>=2xy,xy