题目内容
计算或化简
(1)(
)-2×(
-
)0÷(-
)-1
(2)
+
.
(1)(
| 1 |
| 2 |
| 3 |
| 2 |
| 1 |
| 3 |
(2)
| 4 |
| x2-4 |
| 4 |
| 2-x |
(1)原式=4×1÷(-3)
=-
;
(2)原式=
-
=
-
=
=-
.
=-
| 4 |
| 3 |
(2)原式=
| 4 |
| (x-2)(x+2) |
| 4 |
| x-2 |
=
| 4 |
| (x-2)(x+2) |
| 4(x+2) |
| (x-2)(x+2) |
=
| -4x-4 |
| (x-2)(x+2) |
=-
| 4x+4 |
| x2-4 |
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