问题 解答题
计算,能简算的要简算:
3×(
2
15
+
1
12
)-
1
4
24×(
3
8
+
1
3
+
5
12
9
17
÷7+
1
7
×
8
17
26
27
×28
5
12
-
3
7
)-(
4
7
-
7
12
4
5
÷〔
5
8
×(1-
1
5
)〕
答案

(1)3×(

2
15
+
1
12
)-
1
4

=

2
5
+
1
4
-
1
4

=

2
5

(2)24×(

3
8
+
1
3
+
5
12
),

=9+8+10,

=27;

(3)

9
17
÷7+
1
7
×
8
17

=(

9
17
+
8
17
)×
1
7

=

1
7

(4)

26
27
×28,

=

26
27
×(27+1),

=26+

26
27

=26

26
27

(5)(

5
12
-
3
7
)-(
4
7
-
7
12
),

=

5
12
-
3
7
-
4
7
+
7
12

=1-1,

=0;

(6)

4
5
÷〔
5
8
×(1-
1
5
)〕,

=

4
5
÷(
5
8
×
4
5
),

=

4
5
×2,

=

8
5

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