题目内容
计算
(1)4
+
-
+4
(2)
÷
×
(3)(
-
)×(
+2
)
(4)
×(-
)÷3
(5)
-
÷2+(3-
)(1+
).
(1)4
| 5 |
| 45 |
| 8 |
| 2 |
(2)
1
|
2
|
1
|
(3)(
| 6 |
|
| 24 |
|
(4)
| 2 |
| b |
| ab5 |
| 3 |
| 2 |
| a3b |
|
(5)
| 48 |
| 54 |
| 3 |
| 1 | ||
|
(1)原式=4
+3
-2
+4
=8
+2
;
(2)原式=
=1;
(3)原式=(
-
)(2
+
)
=(
-
)×
=16-
=
;
(4)原式=-2b
•
=-3a2b
;
(5)原式=4
-
+(3-
)(1+
)
=4
-
+3-
+
-1
=4
-
+2.
| 5 |
| 5 |
| 2 |
| 2 |
=8
| 5 |
| 2 |
(2)原式=
|
=1;
(3)原式=(
| 6 |
| ||
| 2 |
| 6 |
2
| ||
| 3 |
=(
| 6 |
| ||
| 2 |
8
| ||
| 3 |
=16-
| 32 |
| 3 |
=
| 16 |
| 3 |
(4)原式=-2b
| ab |
3a
| ||
| 2 |
| ||
| 3b |
=-3a2b
| ab |
(5)原式=4
| 3 |
3
| ||
| 2 |
| 3 |
| ||
| 3 |
=4
| 3 |
3
| ||
| 2 |
| 3 |
| 3 |
=4
| 3 |
3
| ||
| 2 |
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