题目内容
(1)3
+
-4
;
(2)(5+2
)(2
-5);
(3)(
-1)2;
(4)(2
-7
)(
+
).
| 18 |
| 1 |
| 5 |
| 50 |
|
(2)(5+2
| 6 |
| 6 |
(3)(
| 6 |
(4)(2
| 6 |
| 2 |
| 2 |
| 6 |
(1)原式=9
+
-2
=8
;
(2)原式=(2
+5)(2
-5)=(2
)2-52=24-25=-1;
(3)原式=(
)2-2
+1=7-2
;
(4)原式=2
•
+2
•
-7
•
-7
•
=4
+12-14-14
=-10
-2.
| 2 |
| 2 |
| 2 |
| 2 |
(2)原式=(2
| 6 |
| 6 |
| 6 |
(3)原式=(
| 6 |
| 6 |
| 6 |
(4)原式=2
| 6 |
| 2 |
| 6 |
| 6 |
| 2 |
| 2 |
| 2 |
| 6 |
| 3 |
| 3 |
| 3 |
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