题目内容
计算:
(1)
-
+
;
(2)
+3
-
+
;
(3)(2
+3
)(2
-3
);
(4)(2
-3
)×
.
(1)
| 27 |
| 12 |
| 25 |
(2)
| 8 |
|
| 1 | ||
|
| ||
| 2 |
(3)(2
| 5 |
| 2 |
| 5 |
| 2 |
(4)(2
| 12 |
|
| 6 |
(1)原式=3
-2
+5=
+5;
(2)原式=2
+
-
+
=
;
(3)原式=20-18=2;
(4)原式=(4
-
)×
=3
×
=9
.
| 3 |
| 3 |
| 3 |
(2)原式=2
| 2 |
| 3 |
| ||
| 2 |
| ||
| 2 |
3
| ||||
| 2 |
(3)原式=20-18=2;
(4)原式=(4
| 3 |
| 3 |
| 6 |
| 3 |
| 6 |
| 2 |
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