(1/2x-2)(1/2x+2)-1/4x(x+8)
=1/4x²-4-1/4x²-2x
=-4-2x
(x-y)(1/9x-y)-(1/3x-y)(1/3x+y)
=1/9x²-1/9xy-xy+y²-1/9x²+y²
=-10/9xy+2y²
(1) (1/2x-2)(1/2x+2)-1/4x(x+8) (2)(x-y)(1/9x-y)-(1/3x-y)(1/3
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