题目内容
计算:(1)
-
;
(2)
+
.
| 12 |
| m2-9 |
| 2 |
| m-3 |
(2)
| x2+9x |
| x2+3x |
| x2-9 |
| x2+6x+9 |
(1)原式=
=
=-
;
(2)原式=
+
=
+
=
=2.
| 12-2(m+3) |
| (m+3)(m-3) |
| -2(m-3) |
| (m+3)(m-3) |
| 2 |
| (m+3) |
(2)原式=
| x(x+9) |
| x(x+3) |
| (x+3)(x-3) |
| (x+3)2 |
| (x+9) |
| (x+3) |
| (x-3) |
| (x+3) |
| 2x+6 |
| x+3 |
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