题目内容

( 
3
4
+
5
8
)×32
5
9
×
3
4
+
5
9
×
1
4
7
13
×25+
7
13
5
4
×
1
8
×16
1
5
+
2
9
×
3
10
1
3
+
1
2
)×12.
分析:(1)(2)(3)(6)运用乘法分配律简算;
(4)运用乘法结合律简算;
(5)先算乘法,再算加法.
解答:解:(1)(
3
4
+
5
8
)×32,
=
3
4
×32+
5
8
×32,
=24+20,
=44;

(2)
5
9
×
3
4
+
5
9
×
1
4

=
5
9
×(
3
4
+
1
4
),
=
5
9
×1,
=
5
9


(3)
7
13
×25+
7
13

=
7
13
×(25+1),
=
7
13
×26,
=14;

(4)
5
4
×
1
8
×16,
=
5
4
×(
1
8
×16),
=
5
4
×2,
=2
1
2


(5)
1
5
+
2
9
×
3
10

=
1
5
+
1
15

=
4
15


(6)(
1
3
+
1
2
)×12,
=
1
3
×12+
1
2
×12,
=4+6,
=10.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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