题目内容

脱式计算.(能简便的用简便方法计算)
12.53-1.35×2-9.3
0.8÷(4-3.75)÷0.1
4
5
+
11
15
+
3
10
7-(
3
4
-
2
5
)
11
12
+
5
8
+
3
8
+
1
12
10-
6
7
-
1
7
分析:(1)先算乘法,然后运用减法的性质简算;
(2)先算括号内的,再算括号外的;
(3)先通分再计算;
(4)先算括号内的,再算括号外的;
(5)运用加法交换律与结合律简算;
(6)运用减法的性质简算.
解答:解:(1)12.53-1.35×2-9.3,
=12.53-2.7-9.3,
=12.53-(2.7+9.3),
=12.53-12,
=0.53;

(2)0.8÷(4-3.75)÷0.1,
=0.8÷0.25÷0.1,
=3.2÷0.1,
=32;

(3)
4
5
+
11
15
+
3
10

=
24
30
+
22
30
+
9
30

=
11
6


(4)7-(
3
4
-
2
5
),
=7-
7
20

=6
13
20


(5)
11
12
+
5
8
+
3
8
+
1
12

=(
11
12
+
1
12
)+(
5
8
+
3
8
),
=1+1,
=2;

(6)10-
6
7
-
1
7

=10-(
6
7
+
1
7
),
=10-1,
=9.
点评:解答此题,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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