题目内容

用简便方法计算,要写出必要的计算过程
7.32-(3.8+1.32)
0.6×24+
3
5
×76
1
3
×
2
5
÷(
1
4
+
1
6

[7+(3-1
1
3
)]×
1
2
+3
1
4
分析:(1)去括号,运用加法交换律与结合律简算;
(2)把分数化为小数,运用乘法分配律简算;
(3)先算
1
3
×
2
5
和括号内的,再算括号外的除法;
(4)先算小括号内的,再算中括号内的,然后算括号外的乘法,最后算加法.
解答:解:(1)7.32-(3.8+1.32),
=7.32-3.8-1.32,
=(7.32-1.32)-3.8,
=6-3.8,
=2.2;

(2)0.6×24+
3
5
×76,
=0.6×24+0.6×76,
=(24+76)×0.6,
=100×0.6,
=60;

(3)
1
3
×
2
5
÷(
1
4
+
1
6
),
=
2
15
÷
5
12

=
2
15
×
12
5

=
8
25


(4)[7+(3-1
1
3
)]×
1
2
+3
1
4

=[7+
5
3
1
2
+3
1
4

=
26
3
×
1
2
+3
1
4

=4
1
3
+3
1
4

=(4+3)+(
1
3
+
1
4
),
=7+
7
12

=7
7
12
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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