题目内容
化简:
(1)
-1;
(2)(x+6)2+(3+x)(3-x).
(1)
| x |
| x-1 |
(2)(x+6)2+(3+x)(3-x).
(1)原式=
-
,
=
,
=
.
(2)原式=x2+12x+36+9-x2,
=12x+45.
| x |
| x-1 |
| x-1 |
| x-1 |
=
| x-(x-1) |
| x-1 |
=
| 1 |
| x-1 |
(2)原式=x2+12x+36+9-x2,
=12x+45.
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