题目内容
计算:
(1)2
+3
-7
+4
(2)2
÷
×2
(3)(
+
)(
-
)
(4)
+6
-2x
.
(1)2
| 5 |
| 2 |
| 5 |
| 2 |
(2)2
| 12 |
| 1 |
| 2 |
| 50 |
|
(3)(
| 5 |
| 6 |
| 5 |
| 6 |
(4)
| 2 |
| 3 |
| 9x |
|
|
(1)原式=-5
+7
;
(2)原式=4
÷
×
=4
×
×
=
;
(3)原式=(
)2-(
)2
=5-6
=-1;
(4)原式=2
+3
-2
=3
.
| 5 |
| 2 |
(2)原式=4
| 3 |
5
| ||
| 2 |
| 3 |
=4
| 3 |
| 2 | ||
5
|
| 3 |
=
12
| ||
| 5 |
(3)原式=(
| 5 |
| 6 |
=5-6
=-1;
(4)原式=2
| x |
| x |
| x |
=3
| x |
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