题目内容
用自己喜欢的方法计算
(1)
-0.4+
-
(2)
×
÷
(3)(
+
)÷
(4)20-[(
+
)÷
]×1.2
(5)
×99
(6)2007×(1-
)×(1-
)×(1-
)×…×(1-
)
(1)
| 7 |
| 13 |
| 6 |
| 13 |
| 3 |
| 5 |
(2)
| 5 |
| 6 |
| 14 |
| 15 |
| 7 |
| 8 |
(3)(
| 3 |
| 8 |
| 7 |
| 16 |
| 13 |
| 16 |
(4)20-[(
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
(5)
| 97 |
| 98 |
(6)2007×(1-
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2007 |
(1)
-0.4+
-
,
=(
+
)-(0.4+0.6),
=1-1,
=0;
(2)
×
÷
,
=
×
×
,
=
;
(3)(
+
)÷
,
=
×
+
×
,
=
+
,
=1;
(4)20-[(
+
)÷
]×1.2,
=20-[
×
]×1.2,
=20-1×1.2,
=20-1.2,
=18.8;
(5)
×99,
=
×(98+1),
=
×98+
×1,
=97+
,
=97
;
(6)2007×(1-
)×(1-
)×(1-
)×…×(1-
),
=2007×
×
×
×…×
×
,
=2007×
,
=1.
| 7 |
| 13 |
| 6 |
| 13 |
| 3 |
| 5 |
=(
| 7 |
| 13 |
| 6 |
| 13 |
=1-1,
=0;
(2)
| 5 |
| 6 |
| 14 |
| 15 |
| 7 |
| 8 |
=
| 5 |
| 6 |
| 14 |
| 15 |
| 8 |
| 7 |
=
| 8 |
| 9 |
(3)(
| 3 |
| 8 |
| 7 |
| 16 |
| 13 |
| 16 |
=
| 3 |
| 8 |
| 16 |
| 13 |
| 7 |
| 16 |
| 16 |
| 13 |
=
| 6 |
| 13 |
| 7 |
| 13 |
=1;
(4)20-[(
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
=20-[
| 5 |
| 6 |
| 6 |
| 5 |
=20-1×1.2,
=20-1.2,
=18.8;
(5)
| 97 |
| 98 |
=
| 97 |
| 98 |
=
| 97 |
| 98 |
| 97 |
| 98 |
=97+
| 97 |
| 98 |
=97
| 97 |
| 98 |
(6)2007×(1-
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2007 |
=2007×
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 2005 |
| 2006 |
| 2006 |
| 2007 |
=2007×
| 1 |
| 2007 |
=1.
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