题目内容
计算:
(1)
+
+3
;
(2)(3
-2
)(3
+2
);
(3)(
-
)2+2
•3
;
(4)(
-
+
)(
-
-
).
(1)
| 48 |
| 12 |
| 3 |
(2)(3
| 2 |
| 3 |
| 2 |
| 3 |
(3)(
| 2 |
| 3 |
|
| 2 |
(4)(
| 5 |
| 3 |
| 2 |
| 5 |
| 3 |
| 2 |
(1)原式=4
+2
+3
=9
;
(2)原式=18-12=6;
(3)原式=5-2
+2
=5;
(4)原式=(
-
)2-(
)2=5-2
+3-2=6-2
.
| 3 |
| 3 |
| 3 |
| 3 |
(2)原式=18-12=6;
(3)原式=5-2
| 6 |
| 6 |
(4)原式=(
| 5 |
| 3 |
| 2 |
| 15 |
| 15 |
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