(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時(shí),分母為0,分式無意義,故x≠2且x≠-2,
同時(shí),x=0時(shí),
x?2 |
x |
當(dāng)x=6時(shí),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 |