Question

求快解答先化简，在求值:x方-2x+1分之x方-1 ÷x-1分之x+1乘以1+x分之1-x ,

其中x=2分之1

Answer 1

:x方-2x+1分之x方-1 ÷x-1分之x+1乘以1+x分之1-x
=(x+1)(x-1)/(x-1)²× (x-1)/(x+1)×[-(x-1)/(x+1)]
=-(x-1)/(x+1)
=(1-x)/(x+1)

Answer 2

求快解答先化简，在求值(x²-1)/(x²-2x 1) ÷(x 1)/(x-1)*(1-x)/(1 x),
其中x=1/2.
原式=(x 1)/(x-1)÷ -(x-1)/(x-1)
=-(x 1)/(x-1)
=-(3/2 )/ (-1/2)
=3.

Answer 3

我有一个问题:当x=-3.2时求x方-4分之x方-4x+4除以(x方+2x分之x-2) +3求解答