题目内容

用你喜欢的方法计算
3
4
×
5
6
+
1
6
×
3
4
5
8
×64×
3
4
5
18
-
5
24
)÷
5
6
40
13
×(26×
3
40
3
8
÷(
1
2
+
1
4
9
22
÷
1
4
÷
6
11
(
3
10
+
3
10
+…+
3
10
)
100个
+
(
2
5
+
2
5
+…+
2
5
)
100个
分析:(1)运用乘法分配律简算;
(2)约分计算;
(3)把除法转化为乘法,运用乘法分配律简算;
(4)先去括号,然后约分计算;
(5)先算括号内的,再算括号外的;
(6)把括号内的算式改写成乘法算式,约分计算,然后相加即可.
解答:解:(1)
3
4
×
5
6
+
1
6
×
3
4

=
3
4
×(
5
6
+
1
6
),
=
3
4
×1,
=
3
4


(2)
5
8
×64×
3
4

=40×
3
4

=30;

(3)(
5
18
-
5
24
)÷
5
6

=(
5
18
-
5
24
)×
6
5

=
5
18
×
6
5
-
5
24
×
6
5

=
1
3
-
1
4

=
1
12


(4)
40
13
×(26×
3
40
),
=
40
13
×26×
3
40

=6;

(5)
3
8
÷(
1
2
+
1
4
),
=
3
8
÷
3
4

=
3
8
×
4
3

=
1
2


(6)
9
22
÷
1
4
÷
6
11

=
9
22
×4×
11
6

=3;

(7)(
3
10
+
3
10
+…+
3
10
)+(
2
5
+
2
5
+…+
2
5
),
=
3
10
×100+
2
5
×100,
=30+40,
=70.
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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