化简:〔1-[2/(x+1)]〕÷[1/(x²-1)]
化简{x²-2x分之x+2-x²-4x+4x分之x-1}除以X分之(x-1)(X-4)乘以(2-x)
化简 (3x/x-1 -x/x+1)÷x/x²-1
[(x+2)/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x
计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1
化简【(x三次方-x平方/x平方+x )-(1-x²/x+1)】÷(2x+1/x+1)
化简分式【(x/x-1)-(x/x²-1)】÷(x²-x/x²-2x+1),并从-1≤x≤
先化简再求值:(x+2/x²-2x - x-1/x²-4x+4)÷ x-4/x,其中x=3/2
先化简,再求值:[(x-2/x²+2x)-(x-1/x²+4x+4)]÷﹙x-4/x+2﹚,其中x&
化简9X-{6-〔-3x+(-1-4x)〕+2x}
2道分式计算[(x+4)(x-2)]/x³+2x²+x÷[(x-2)/x·(x+4)/(x+1)]2
化简 x(x-1)+2x(x+1)-3x(2x-5)
化简:2/(x+1)-(x-2)/(x²-1)÷(x²-2x)/(x²-2x+1)