题目内容
计算
(1)(
+
)-(
-
)
(2)
÷
×
(3)
•(
÷2
)
(4)(3
)2-(5
)2
(5)(
+6)(3-
)
(1)(
| 48 |
| 20 |
| 12 |
| 5 |
(2)
1
|
2
|
1
|
(3)
| ||
| 2b |
|
|
(4)(3
| 5 |
| 3 |
(5)(
| 5 |
| 5 |
(1)原式=(4
+2
)-(2
-
)
=4
+2
-2
+
=2
+3
.
(2)原式=
÷
×
=
×
=1;
(3)原式=
×(
÷
)=
×
=
;
(4)原式=45-75=-30;
(5)原式=3
-5+18-6
=13-3
.
| 3 |
| 5 |
| 3 |
| 5 |
=4
| 3 |
| 5 |
| 3 |
| 5 |
=2
| 3 |
| 5 |
(2)原式=
| ||
| 3 |
| ||
| 3 |
| ||
| 5 |
|
| ||
| 5 |
(3)原式=
| ||
| 2b |
| ||
| a |
2
| ||
| b |
| ||
| 2b |
b
| ||
| 2a |
| ||
| 4 |
(4)原式=45-75=-30;
(5)原式=3
| 5 |
| 5 |
| 5 |
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