问题
解答题
先化简,再求值:
|
答案
÷x2-4x+4 2x
+1x2-2x x2
=
÷(x-2)2 2x
+1x(x-2) x2
=
×(x-2)2 2x
+1x2 x(x-2)
=
+1x-2 2
=
,x 2
当x=0或2时,分式无意义,
故x只能等于1,
原式=
.1 2
先化简,再求值:
|
÷x2-4x+4 2x
+1x2-2x x2
=
÷(x-2)2 2x
+1x(x-2) x2
=
×(x-2)2 2x
+1x2 x(x-2)
=
+1x-2 2
=
,x 2
当x=0或2时,分式无意义,
故x只能等于1,
原式=
.1 2