题目内容

(2012?遂昌县)用递等式计算.
①[1-(
1
8
+
2
3
)]×36
②(
2
9
+
7
12
)×36
③7.5×4.7+4.7×2.5
④25.3×12-33.46÷0.35
5
6
×[
2
3
÷(1-
13
15
)]
1
4
+(
5
8
-
3
10
)÷
1
2
分析:①④⑤⑥根据四则混合运算的运算顺序计算即可.
②③可据乘法分配律进行计算;
解答:解:①[1-(
1
8
+
2
3
)]×36,
=[1-(
3
24
+
16
24
)]×36,
=[1-
19
24
]×36,
=
5
24
×36,
=
15
2


②(
2
9
+
7
12
)×36,
=36×
2
9
+
7
12
×36

=8+21,
=29;

③7.5×4.7+4.7×2.5,
=4.7×(7.5+2.5),
=4.7×10,
=47;

④25.3×12-33.46÷0.35,
=303.6-95.6,
=208;

5
6
×[
2
3
÷(1-
13
15
)],
=
5
6
×[
2
3
÷
2
15
],
=
5
6
×
[
2
3
×
15
2
],
=
5
6
×5,
=4
1
6


1
4
+(
5
8
-
3
10
)÷
1
2

=
1
4
+(
25
40
-
12
40
)×2,
=
1
4
+
13
40
×2,
=
5
20
+
13
20

=
9
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.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网