题目内容
计算:
(1)2
-7
+4
(2)
-
+
(3)
-
×
(4)(
-
)2007×(
+
)2008.
(1)2
3 |
12 |
27 |
(2)
18 |
1 |
2 |
12 |
2 | ||
|
(3)
| ||||
|
|
12 |
(4)(
2 |
3 |
2 |
3 |
(1)原式=2
-14
+12
=0,
(2)原式=3
-
+
+1=3
+1,
(3)原式=
-
×2
=3-2=1,
(4)原式=(
-
)2007(
+
)2007•(
+
)
=-1×(
+
)=-
-
.
3 |
3 |
3 |
(2)原式=3
2 |
3 |
3 |
2 |
(3)原式=
3
| ||
|
| ||
3 |
3 |
(4)原式=(
2 |
3 |
2 |
3 |
2 |
3 |
=-1×(
2 |
3 |
2 |
3 |
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