A cura di: Antonio Bernardo
$(4/(x^2-4) – (x-2)/(x+2))(1-6/(4-x))(1-2/x)$
$(4/((x-2)(x+2)) – (x-2)/(x+2))((4-x-6)/(4-x))((x-2)/x)$
$(4-(x-2)(x-2))/((x+2)(x-2))*(-x-2)/(4-x)*(x-2)/x$
$(4-(x-2)(x-2))/((x+2)(x-2))*-(x+2)/(4-x)*(x-2)/x$
$(4-x^2+4x-4)*(-1)/(x(4-x))$
$(-x^2+4x)*(-1)/(x(4-x))$
$x(-x+4)*(-1)/(x(4-x))$
$=-1$
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