题目内容

(2009?江安县模拟)计算下面各题.
8470-104×65     
7.12×4-1.12÷0.25    
72×(
5
9
-
5
12
)
+10
1
6
+
1
9
-
1
12
)×3      
1-
1
6
÷
5
12

1
7
9
×[(
3
8
+0.25)÷(
5
6
-
5
9
)].
分析:(1)(2)根据整数和小数四则混合运算顺序解答;
(3)(4)用乘法分配律解答;
(5)(6)根据整数、分数和小数四则运算顺序解答.
解答:解:(1)8470-104×65,
=8470-6760,
=1710;

(2)7.12×4-1.12÷0.25,
=28.48-4.48,
=24;

(3)72×(
5
9
-
5
12
)
+10,
=72×
5
9
-72×
5
12
+10,
=40-30+10,
=20;

(4)(
1
6
+
1
9
-
1
12
)×3,
=
1
6
×3+
1
9
×3-
1
12
×3,
=
1
2
+
1
3
-
1
4

=
6
12
+
4
12
-
3
12

=
7
12

(5)1-
1
6
÷
5
12

=1-
2
5

=
3
5


(6)1
7
9
×[(
3
8
+0.25)÷(
5
6
-
5
9
)],
=1
7
9
×[(
3
8
+0.25)÷(
5
6
-
5
9
)],
=1
7
9
×[
5
8
÷
5
18
],
=1
7
9
×
9
4

=4.
点评:本题主要考查了学生对于四则混合运算的把握,注意解答过程中的简算.
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