题目内容

(2012?瑶海区)
2
3
÷
1
5
+
1
3
÷
5
8
1
5
×
2
7
+
5
7
÷5
5.6×123-5.6×24+5.6
24×(
3
8
+
5
6
+
1
4
16
5
×3÷
4
5
÷
3
8
23÷[
9
14
×
5
6
-
4
9
)].
分析:(1)先算括号里面的加法,再按照从左到右顺序计算,
(2)(3)(4)运用乘法分配律解答,
(5)按照从左到右顺序计算,
(6)先算小括号里面的,再算中括号里面的,最后算括号外面的解答.
解答:解:(1)
2
3
÷
1
5
+
1
3
÷
5
8

=
2
3
÷
8
15
÷
5
8

=
5
4
÷
5
8

=2;

(2)
1
5
×
2
7
+
5
7
÷
5,
=
1
5
×
2
7
+
5
7
×
1
5

=
1
5
×(
2
7
+
5
7
),
=
1
5
×
1,
=
1
5


(3)5.6×123-5.6×24+5.6,
=5.6×(123-24+1),
=5.6×100,
=560;

(4)24×(
3
8
+
5
6
+
1
4
),
=24×
3
8
+
24×
5
6
+24×
1
4

=9+20+6,
=35;

(5)
16
5
÷3÷
4
5
÷
3
8

=
16
15
÷
4
5
÷
3
8

=
4
3
÷
3
8

=3
5
9


(6)23÷[
9
14
×
5
6
-
4
9
)],
=23÷[
9
14
×
7
18
],
=23÷
1
4

=92.
点评:本题主要考查学生依据四则运算计算方法,依据正确选择并运用简便算法解决问题的能力.
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