问题 解答题
1-(
1
12
+
1
15
)×2
=
6
7
-
6
7
×(
2
3
+
1
9
)
=
15
16
÷(
5
12
÷
5
8
+
3
8
)
=
(
5
6
-
1
4
×
2
3
1
6
=
4
9
÷[(
2
3
-
2
9
2
4
]
=
(
3
8
-
1
4
)÷(
8
9
×
3
4
)
=
答案

(1)1-(

1
12
+
1
15
)×2,

=1-(

5
60
+
4
60
)×2,

=1-

9
60
×2,

=1-

3
10

=

7
10

(2)

6
7
-
6
7
×(
2
3
+
1
9
),

=

6
7
-
6
7
×(
6
9
+
1
9
),

=

6
7
-
6
7
×
7
9

=

6
7
×(1-
7
9
),

=

6
7
×
2
9

=

4
21

(3)

15
16
÷(
5
12
÷
5
8
+
3
8
),

=

15
16
÷(
5
12
×
8
5
+
3
8
),

=

15
16
÷(
8
12
+
3
8
),

=

15
16
÷(
16
24
+
9
24
),

=

15
16
÷
25
24

=

15
16
×
24
25

=

9
10

(4)(

5
6
-
1
4
×
2
3
)÷
1
6

=(

5
6
-
1
6
)÷
1
6

=

4
6
×6,

=4;

(5)

4
9
÷[(
2
3
-
2
9
)×
2
4
],

=

4
9
÷[(
6
9
-
2
9
)]×
1
2
],

=

4
9
÷[
4
9
×
1
2
],

=

4
9
÷
2
9

=

4
9
×
9
2

=2;

(6)(

3
8
-
1
4
)÷(
8
9
×
3
4
),

=(

3
8
-
2
8
)÷
2
3

=

1
8
×
3
2

=

3
16

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