题目内容

怎样算简便就怎样算
3×(
2
15
+
1
12
)-
1
4
24×(
3
8
+
1
3
+
5
12
9
17
÷7+
1
7
×
8
17
26
27
×28.
(1)3×(
2
15
+
1
12
)-
1
4

=3×
13
60
-
1
4

=
13
20
-
5
20

=
2
5


(2)24×(
3
8
+
1
3
+
5
12
),
=24×
3
8
+24×
1
3
+24×
5
12

=9+8+10,
=27;

(3)
9
17
÷7+
1
7
×
8
17

=
9
17
×
1
7
+
1
7
×
8
17

=(
9
17
+
8
17
)×
1
7

=1×
1
7

=
1
7


(4)
26
27
×28,
=
26
27
×(27+1),
=
26
27
×27+
26
27

=26+
26
27

=26
26
27
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