化简:x2+4x−2+4x/2−x.
问题描述:
化简:
+
x2+4 x−2
. 4x 2−x
答
+
x2+4 x−2
=4x 2−x
−
x2+4 x−2
=4x x−2
=
x2+4−4x x−2
=x-2.(x−2)2
x−2