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2
5
-
2
5
×
3
4
÷
5
2
2-
5
9
-
4
15
÷
3
5
2
5
×
5
9
+
2
5
÷
9
4
6
7
÷(
4
9
+
2
3
×
5
6
( 
5
6
+
3
8
 )×48
8
17
÷23+
1
23
×
9
17
分析:(1)先算乘法,再算除法,最后算减法;
(2)先算除法,再根据减法的性质简算;
(3)(6)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的乘法,再算小括号里面的加法,最后算括号外的除法;
(5)运用乘法分配律简算.
解答:解:(1)
2
5
-
2
5
×
3
4
÷
5
2

=
2
5
-
3
10
÷
5
2

=
2
5
-
3
25

=
7
25


(2)2-
5
9
-
4
15
÷
3
5

=2-
5
9
-
4
9

=2-(
5
9
+
4
9
),
=2-1,
=1;

(3)
2
5
×
5
9
+
2
5
÷
9
4

=
2
5
×
5
9
+
2
5
×
4
9

=
2
5
×(
5
9
+
4
9
),
=
2
5
×1,
=
2
5


(4)
6
7
÷(
4
9
+
2
3
×
5
6
),
=
6
7
÷(
4
9
+
5
9
),
=
6
7
÷1,
=
6
7


(5)( 
5
6
+
3
8
 )×48,
=
5
6
×48+
3
8
×48,
=40+18,
=58;

(6)
8
17
÷23+
1
23
×
9
17

=
8
17
×
1
23
+
1
23
×
9
17

=
1
23
×(
8
17
+
9
17
),
=
1
23
×1,
=
1
23
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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