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
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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
已知x=2+1,则x-2x2-1÷2x+2x2+2x+1+1x-1=______.已知 x= 2 +1 ,则 x-2 x 2 -1 ÷ 2x+2 x 2 +2x+1 + 1 x-1 =______.
急诊医疗服务体系()的组成包括____、____、____