问题
解答题
先化简:
|
答案
原式=
•4 (x-2)2
+x-2 x x-4 x-2
=
+4 x(x-2)
…(1分)x2-4x x(x-2)
=
…(2分)x2-4x+4 x(x-2)
=
=(x-2)2 x(x-2)
.…(3分)x-2 x
当x=1时,原式=-1.…(5分)
先化简:
|
原式=
•4 (x-2)2
+x-2 x x-4 x-2
=
+4 x(x-2)
…(1分)x2-4x x(x-2)
=
…(2分)x2-4x+4 x(x-2)
=
=(x-2)2 x(x-2)
.…(3分)x-2 x
当x=1时,原式=-1.…(5分)