先化简,在求值:x2-2x+1 1 -----------+---------- ,其中x=-1 X2-1 X+1

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先化简,在求值:x2-2x+1 1 -----------+---------- ,其中x=-1 X2-1 X+1

先化简,在求值:x2-2x+1 1 -----------+---------- ,其中x=-1 X2-1 X+1
先化简,在求值:x2-2x+1 1 -----------+---------- ,其中x=-1 X2-1 X+1

先化简,在求值:x2-2x+1 1 -----------+---------- ,其中x=-1 X2-1 X+1
原式=1/(x-1)²+(x+1)/(x+1)(x-1)
=1/(x-1)²+1/(x-1)
=(1+x-1)/(x-1)²
=x/(x-1)²
=-1/(-1-1)²
=-1/4

(x^2-2x+1)/(x^2-1)+1/(x+1)
=(x-1)^2/(x-1)(x+1)+1/(x+1)
=(x-1)/(x+1)+1/(x+1)
=(x-1+1)/(x+1)
=x/(x+1)
当x=-1时,分式无意义