计算:
(1)(+
)+(-2
)-(-2
)-(+3
);
(2)(-2)3×8-8×(
)3+8÷
;
(3)(
-
+
)÷(-
);
(4)-99
×36(用简便方法).
(1)(+
| 1 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
(2)(-2)3×8-8×(
| 1 |
| 2 |
| 1 |
| 8 |
(3)(
| 2 |
| 9 |
| 1 |
| 4 |
| 1 |
| 18 |
| 1 |
| 36 |
(4)-99
| 71 |
| 72 |
| 1 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 8 |
| 2 |
| 9 |
| 1 |
| 4 |
| 1 |
| 18 |
| 1 |
| 36 |
| 71 |
| 72 |