题目内容
化简或计算:
(1)
+3
;
(2)
-
;
(3)(
-3
)•
;
(4)(2-
)(3+
).
(1)
| 45 |
| 80 |
(2)
|
| 14 |
(3)(
|
| 3 |
| 12 |
(4)(2-
| 2 |
| 2 |
(1)原式=3
+12
=15
;
(2)原式=
-
=-
;
(3)原式=(
-3
)•2
=
-18;
(4)原式=6+2
-3
-2=4-
.
| 5 |
| 5 |
| 5 |
(2)原式=
| ||
| 7 |
| 14 |
| 6 |
| 7 |
| 14 |
(3)原式=(
| ||
| 4 |
| 3 |
| 3 |
| 3 |
| 2 |
| 2 |
(4)原式=6+2
| 2 |
| 2 |
| 2 |
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