题目内容
计算化简:
(1)(
)2-(cos60°)0+|-4|;
(2)
+
.
(1)(
| 5 |
(2)
| 6 |
| x2-9 |
| 1 |
| x+3 |
(1)原式=5-1+4=8;
(2)原式=
+
=
=
=
.
(2)原式=
| 6 |
| (x+3)(x-3) |
| 1 |
| x+3 |
=
| 6+x-3 |
| (x+3)(x-3) |
=
| x+3 |
| (x+3)(x-3) |
=
| 1 |
| x-3 |
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