(X2y2-4)(-x2y2--4)-49xy-1/2)(xy-1/2),其中x=1,y=-2先化简再求值

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(X2y2-4)(-x2y2--4)-49xy-1/2)(xy-1/2),其中x=1,y=-2先化简再求值(X2y2-4)(-x2y2--4)-49xy-1/2)(xy-1/2),其中x=1,y=-2

(X2y2-4)(-x2y2--4)-49xy-1/2)(xy-1/2),其中x=1,y=-2先化简再求值
(X2y2-4)(-x2y2--4)-49xy-1/2)(xy-1/2),其中x=1,y=-2先化简再求值

(X2y2-4)(-x2y2--4)-49xy-1/2)(xy-1/2),其中x=1,y=-2先化简再求值
xy=-2
(X2y2-4)(-x2y2--4)-4(xy-1/2)(xy-1/2)
=(16-x^4y^4)-(2xy-1)^2
=(16-(-2)^4)-(2*(-2)-1)^2
=0-(-5)^2
=-25