题目内容

用自己喜欢的方法计算
(1)
7
13
-0.4+
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
]×1.2
(5)
97
98
×99
(6)2007×(1-
1
2
)×(1-
1
3
)×(1-
1
4
)×…×(1-
1
2007
(1)
7
13
-0.4+
6
13
-
3
5

=(
7
13
+
6
13
)-(0.4+0.6),
=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
]×1.2,
=20-[
5
6
×
6
5
]×1.2,
=20-1×1.2,
=20-1.2,
=18.8;

(5)
97
98
×99,
=
97
98
×
(98+1),
=
97
98
×
98+
97
98
×1,
=97+
97
98

=97
97
98


(6)2007×(1-
1
2
)×(1-
1
3
)×(1-
1
4
)×…×(1-
1
2007
),
=2007×
1
2
×
2
3
×
3
4
×…×
2005
2006
×
2006
2007

=2007×
1
2007

=1.
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