先化简,再求值:(x²-1)/(x+2) ÷ (1/x+2 -1),其中x=1/3.
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先化简,再求值:(x²-1)/(x+2) ÷ (1/x+2 -1),其中x=1/3.
先化简,再求值:(x²-1)/(x+2) ÷ (1/x+2 -1),其中x=1/3.
先化简,再求值:(x²-1)/(x+2) ÷ (1/x+2 -1),其中x=1/3.
(x²-1)/(x+2) ÷ (1/x+2 -1)
=-(x+1)(x-1)(x+2)/(x+2)(x+1)
=1-x
1-x=1-1/3=2/3
(1/x+2 -1)其中+2-1在不在分母里