题目内容
用合理的方法计算:
(1)
+
×
(2)
×2007
(3)(
+
)×8+
(4)
×(
+
÷
)
(5)
÷[1÷(
-
)].
(1)
| 2 |
| 3 |
| 1 |
| 3 |
| 3 |
| 4 |
(2)
| 2005 |
| 2006 |
(3)(
| 5 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
(4)
| 3 |
| 5 |
| 1 |
| 7 |
| 8 |
| 21 |
| 2 |
| 3 |
(5)
| 1 |
| 6 |
| 3 |
| 5 |
| 3 |
| 10 |
(1)
+
×
,
=
+
,
=
+
,
=
;
(2)
×2007,
=
×(2006+1),
=
×2006+
,
=2005+
,
=2005
;
(3)(
+
)×8+
,
=
×8+
×8+
,
=5+(
+
),
=5+1,
=6;
(4)
×(
+
÷
),
=
×(
+
×
),
=
×(
+
),
=
×
,
=
;
(5)
÷[1÷(
-
)],
=
÷[1÷(
-
)],
=
÷[1÷
],
=
÷
,
=
×
,
=
.
| 2 |
| 3 |
| 1 |
| 3 |
| 3 |
| 4 |
=
| 2 |
| 3 |
| 1 |
| 4 |
=
| 8 |
| 12 |
| 3 |
| 12 |
=
| 11 |
| 12 |
(2)
| 2005 |
| 2006 |
=
| 2005 |
| 2006 |
=
| 2005 |
| 2006 |
| 2005 |
| 2006 |
=2005+
| 2005 |
| 2006 |
=2005
| 2005 |
| 2006 |
(3)(
| 5 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
=
| 5 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
=5+(
| 8 |
| 27 |
| 19 |
| 27 |
=5+1,
=6;
(4)
| 3 |
| 5 |
| 1 |
| 7 |
| 8 |
| 21 |
| 2 |
| 3 |
=
| 3 |
| 5 |
| 1 |
| 7 |
| 8 |
| 21 |
| 3 |
| 2 |
=
| 3 |
| 5 |
| 1 |
| 7 |
| 4 |
| 7 |
=
| 3 |
| 5 |
| 5 |
| 7 |
=
| 3 |
| 7 |
(5)
| 1 |
| 6 |
| 3 |
| 5 |
| 3 |
| 10 |
=
| 1 |
| 6 |
| 6 |
| 10 |
| 3 |
| 10 |
=
| 1 |
| 6 |
| 3 |
| 10 |
=
| 1 |
| 6 |
| 10 |
| 3 |
=
| 1 |
| 6 |
| 3 |
| 10 |
=
| 1 |
| 20 |
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