计算:x2+2x+1x+2÷x2-1x-1-1x+2计算: x 2 +2x+1 x+2 ÷ x 2 -1 x-1 - 1 x+2
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先化简再求值:()× 2x 2 -x x 2 +2x+1 ,其中x满足x 2 -x-1=0.
化简:x-1x2+x÷x2-2x+1x2-1-1x.化简: x-1 x 2 +x ÷ x 2 -2x+1 x 2 -1 - 1 x
计算:() x-1 x+2 ÷ x 2 -2x+1 x 2 -4 + 1 x-1
化简分式:() 2 -[x+ 1 x - 1 1-x- 1 x ] 2 ÷ x 2 + 1 x 2 -x- 1 x +3 x 2 + 1 x 2 -2x- 2 x +3