题目内容

(1)(284+16)×(512-8208÷18)+
5
7
×
3
25
+
3
7

(2)6-1.19×3-0.43+
1
4
+
3
4
÷
2
3

(3)3.2×(1.5+2.5)÷1.6+14×
8
7
-
5
6
×
12
15

(4)27.85-(7.85+3.4)+
17
32
-
3
4
×
9
24
分析:根据整数、分数、小数四则混合运算的顺序进行解答即可.
解答:解:(1)(284+16)×(512-8208÷18)+
5
7
×
3
25
+
3
7

=300×(512-456)+
3
35
+
3
7

=300×56+
3
35
+
3
7

=16800+
3
35
+
3
7

=16800
18
35


(2)6-1.19×3-0.43+
1
4
+
3
4
÷
2
3

=6-3.57-0.43+
1
4
+
9
8

=6-(3.57-0.43)+
1
4
+
9
8

=6-4+
1
4
+
9
8

=2+
1
4
+
9
8

=3
3
8


(3)3.2×(1.5+2.5)÷1.6+14×
8
7
-
5
6
×
12
15

=3.2×4÷1.6+14×
8
7
-
5
6
×
12
15

=8+16-
2
3

=24-
2
3

=23
1
3


(4)27.85-(7.85+3.4)+
17
32
-
3
4
×
9
24

=27.85-7.85-3.4+
17
32
-
9
32

=20-3.4+
1
4

=16.6+
1
4

=16.85.
点评:本题考查了简单的四则混合运算,关键是理清楚运算的顺序,然后根据运算顺序逐步求解即可.
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