x(x+2) |
(x?1)(x+2) |
3 |
(x?1)(x+2) |
(x?1)(x+2) |
(x?1)(x+2) |
=
x2+2x?3?x2?x+2 |
(x?1)(x+2) |
=
x?1 |
(x?1)(x+2) |
=
1 |
x+2 |
x的取值范圍是x≠-2且x≠1的實(shí)數(shù).
x |
x?1 |
3 |
(x?1)(x+2) |
x(x+2) |
(x?1)(x+2) |
3 |
(x?1)(x+2) |
(x?1)(x+2) |
(x?1)(x+2) |
x2+2x?3?x2?x+2 |
(x?1)(x+2) |
x?1 |
(x?1)(x+2) |
1 |
x+2 |