log1/2(x^2-x-2)>log1/2(x-1)-log1/2(1/2)
log1/2(x^2-x-2)>log1/2((x-1)/(1/2))
log1/2(x^2-x-2)>log1/2(2(x-1))
因为1／2是底数,所以(x^2-x-2)<2(x-1)
x^2-x-2<2x-2
x^2-3x<0
0
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