(x+2)(x−2) |
(x−2)2 |
x−2 |
x+2 |
x−2 |
x |
=
(x+2)2−(x−2)2 |
(x+2)(x−2) |
x−2 |
x |
=
8x |
(x+2)(x−2) |
x−2 |
x |
=
8 |
x+2 |
∵原式中,x=2或x=-2时,分母为0,分式无意义,故x≠2且x≠-2,
同时,x=0时,
x−2 |
x |
当x=6时,原式=1.
x2−4 |
x2−4x+4 |
2−x |
x+2 |
x |
x−2 |
(x+2)(x−2) |
(x−2)2 |
x−2 |
x+2 |
x−2 |
x |
(x+2)2−(x−2)2 |
(x+2)(x−2) |
x−2 |
x |
8x |
(x+2)(x−2) |
x−2 |
x |
8 |
x+2 |
x−2 |
x |