题目内容
计算题:
(1)
+2
-3
;
(2)
-(
+1)(
-1);
(3)
+6
-2
.
(1)
| 12 |
| 75 |
| 27 |
(2)
| ||||
|
| 2 |
| 2 |
(3)
| 2 |
| 3 |
| 9x |
|
|
(1)
+2
-3
,
=2
+10
-9
,
=(2+10-9)
,
=3
;
(2)
-(
+1)(
-1),
=2-1-(2-1),
=1-1,
=0;
(3)
+6
-2
,
=2
+3
-
,
=
.
| 12 |
| 75 |
| 27 |
=2
| 3 |
| 3 |
| 3 |
=(2+10-9)
| 3 |
=3
| 3 |
(2)
| ||||
|
| 2 |
| 2 |
=2-1-(2-1),
=1-1,
=0;
(3)
| 2 |
| 3 |
| 9x |
|
|
=2
| x |
| x |
| 2 |
| x |
| x |
=
(5x-2)
| ||
| x |
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