题目内容

计算下面各题,能简算的要简算.
5
16
×12×
3
4
×16
17
18
-
3
4
+
1
6
)÷
1
36
2
3
×
8
5
+
1
3
÷
5
8
9
16
÷(
3
8
+
1
16
4
5
×
5
6
+
2
5
÷
3
5
     
1
2
-
8
9
÷
5
6
×
3
16
分析:(1)运用乘法交换律变为
5
16
×16×12×
3
4
,约分即可;
(2)把除法改为乘法,运用乘法分配律简算;
(3)把除法改为乘法,运用乘法分配律的逆运算简算;
(4)先算括号内的,再算括号外的;
(5)(6)题,把除法改为乘法,按运算顺序计算.
解答:解:(1)
5
16
×12×
3
4
×16,
=
5
16
×16×12×
3
4

=5×9,
=45;

(2)(
17
18
-
3
4
+
1
6
)÷
1
36

=(
17
18
-
3
4
+
1
6
)×36,
=
17
18
×36-
3
4
×36+
1
6
×36,
=34-27+6,
=13;

(3)
2
3
×
8
5
+
1
3
÷
5
8

=
2
3
×
8
5
+
1
3
×
8
5

=(
2
3
+
1
3
)×
8
5

=1×
8
5

=
8
5


(4)
9
16
÷(
3
8
+
1
16
),
=
9
16
÷(
6
16
+
1
16
),
=
9
16
÷
7
16

=
9
16
×
16
7

=
9
7


(5)
4
5
×
5
6
+
2
5
÷
3
5

=
2
3
+
2
5
×
5
3

=
2
3
+
2
3

=
4
3


(6)
1
2
-
8
9
÷
5
6
×
3
16

=
1
2
-
8
9
×
6
5
×
3
16

=
1
2
-
1
5

=
3
10
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律或性质进行简便计算.
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