x的平方+2x+1/2x-6/(x-1-3x/x-3),其中x=5
=(x+1)^2/2x-6/{[(x-1)(x-3)-3x]/(x-3)},
=(x+1)^2/2(x-3) * (x-3)/(x^2-4x+3-3x)
=(x+1)^2/2(x^2-7x+3)
=(5+1)^2/2(5^2-7*5+3)
=36/(-14)
=-18/7
,
x的平方+2x+1/2x-6/(x-1-3x/x-3),其中x=5
=(x+1)^2/2x-6/{[(x-1)(x-3)-3x]/(x-3)},
=(x+1)^2/2(x-3) * (x-3)/(x^2-4x+3-3x)
=(x+1)^2/2(x^2-7x+3)
=(5+1)^2/2(5^2-7*5+3)
=36/(-14)
=-18/7
,