题目内容

递等式计算,能简便的用简便方法.
4
9
×
5
13
+
5
13
×
5
9
5
8
×
2
7
×16
49×
11
48
34
35
×12+
12
35
3
4
+
1
5
)×12×35
7
8
+
1
6
+
2
3
)×48.
分析:(1)(3)(4)(5)(6)运用乘法分配律解答,
(2)运用乘法交换律解答.
解答:解:(1)
4
9
×
5
13
+
5
13
×
5
9

=(
4
9
+
5
9
)×
5
13

=1×
5
13

=
5
13


(2)
5
8
×
2
7
×16,
=
5
8
×16×
2
7

=10×
2
7

=2
6
7


(3)49×
11
48

=48×
11
48
+1×
11
48

=11+
11
48

=11
11
48


(4)
34
35
×12+
12
35

=12×(
34
35
+
1
35
),
=12×1,
=12;

(5)(
3
4
+
1
5
)×12×35,
=
3
4
×12×35+
1
5
×12×35,
=9×35+12×7,
=315+84,
=499;

(6)(
7
8
+
1
6
+
2
3
)×48,
=
7
8
×48+
1
6
×48+
2
3
×48,
=42+8+32,
=82.
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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