题目内容
计算:
(1)
-3
+
;
(2)(
)2+
+1;
(3)
-
+2
-
;
(4)
+6x
-4x2
.
(1)
| 50 |
| 8 |
| 18 |
(2)(
| ||
| 2 |
| ||
| 2 |
(3)
| 24 |
| 1.5 |
|
5
| ||||
|
(4)
| 1 |
| 2 |
| x3 |
|
|
(1)原式=5
-6
+3
=2
;
(2)原式=
(
+1)+1=
×
+1=2;
(3)原式=2
-
+
-5-2
=
-5;
(4)原式=
+6x×
-
=-
.
| 2 |
| 2 |
| 2 |
| 2 |
(2)原式=
| ||
| 2 |
| ||
| 2 |
| ||
| 2 |
| ||
| 2 |
(3)原式=2
| 6 |
| ||
| 2 |
2
| ||
| 3 |
| 6 |
| ||
| 6 |
(4)原式=
x
| ||
| 2 |
| ||
| 3 |
4x2
| ||
| x |
3x
| ||
| 2 |
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