先化简再求值:(x-2)/(x²-1)÷(2x+2)/(x²+2x+1)+1/(x-1),其中x=-1/2
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先化简再求值:(x-2)/(x²-1)÷(2x+2)/(x²+2x+1)+1/(x-1),其中x=-1/2先化简再求值:(x-2)/(x²-1)÷(2x+2)/(x
先化简再求值:(x-2)/(x²-1)÷(2x+2)/(x²+2x+1)+1/(x-1),其中x=-1/2
先化简再求值:(x-2)/(x²-1)÷(2x+2)/(x²+2x+1)+1/(x-1),其中x=-1/2
先化简再求值:(x-2)/(x²-1)÷(2x+2)/(x²+2x+1)+1/(x-1),其中x=-1/2
(x-2)/(x²-1)÷(2x+2)/(x²+2x+1)+1/(x-1),其中x=-1/2
=(x-2)/(x+1)(x-1)×(x+1)²/2(x+1)
=(x-2)/2(x-1)
=(-1/2-2)/2(-1/2-1)
=5/6;
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