题目内容
计算:
(1)
-
+
;
(2)(2-
)2;
(3)2
×
÷5
;
(4)(2
+3
)(2
-3
).
(1)
| 18 |
| 32 |
| 2 |
(2)(2-
| 3 |
(3)2
| 12 |
| ||
| 4 |
| 2 |
(4)(2
| 3 |
| 2 |
| 3 |
| 2 |
(1)原式=3
-4
+
=0;
(2)原式=4-4
+3
=7-4
;
(3)原式=4
×
×
=
;
(4)原式=(2
)2-(3
)2
=12-18
=-6.
| 2 |
| 2 |
| 2 |
=0;
(2)原式=4-4
| 3 |
=7-4
| 3 |
(3)原式=4
| 3 |
| ||
| 4 |
| 1 | ||
5
|
=
3
| ||
| 10 |
(4)原式=(2
| 3 |
| 2 |
=12-18
=-6.
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