已知X=-3/4,Y=4/3,求(X²-Y²)²-(X²+Y²)²的值
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已知X=-3/4,Y=4/3,求(X²-Y²)²-(X²+Y²)²的值已知X=-3/4,Y=4/3,求(X²-Y²)
已知X=-3/4,Y=4/3,求(X²-Y²)²-(X²+Y²)²的值
已知X=-3/4,Y=4/3,求(X²-Y²)²-(X²+Y²)²的值
已知X=-3/4,Y=4/3,求(X²-Y²)²-(X²+Y²)²的值
答:
x=-3/4,y=4/3
所以:xy=-1
(x^2-y^2)^2-(x^2+y^2)^2
=(x^2-y^2+x^2+y^2)*(x^2-y^2-x^2-y^2)
=(2x^2)*(-2y^2)
=-4(xy)^2
=-4*(-1)^2
=-4
(X²-Y²)²-(X²+Y²)²
=(X4+y4-2X²Y²)-(x4+y4+2X²Y²)
=-4X²Y²
=-4(-3/4)2(4/3)2
=-4