题目内容
计算:
(1)
-
-(
-2
);
(2)
÷
×(
-2)+2(
+1)0;
(3)
÷(
+
)+
;
(4)10
×[(
)2-(
)2].
(1)
| 8 |
| 1 |
| 8 |
| 48 |
| 2 |
| 3 |
4
|
|
(2)
| 3 |
| 1 | ||
|
| 8 |
| 2 |
(3)
| 6 |
| 1 | ||
|
| 1 | ||
|
| 50 |
(4)10
|
| ||
| 2 |
| ||
| 2 |
(1)原式=2
-
-
+
=
+
;
(2)原式=
(
+1)(2
-2)+2=2
(
+1)(
-1)+2=2
+2;
(3)原式=
÷
+5
=
+5
=6
-6
+5
=6
-
;
(4)原式=2
(
+
)(
-
)=2
×
×1=10.
| 2 |
| ||
| 2 |
| 2 |
| 3 |
| 2 |
| ||
| 2 |
(2)原式=
| 3 |
| 2 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
(3)原式=
| 6 |
| ||||
|
| 2 |
| 6 | ||||
|
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
| 2 |
(4)原式=2
| 5 |
| ||
| 2 |
| ||
| 2 |
| ||
| 2 |
| ||
| 2 |
| 5 |
| 5 |
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