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 |
| ||||||||||||||||
7-(
|
|
10-
|
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.
(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)7-(
-
),
=7-
,
=6
;
(5)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(6)10-
-
,
=10-(
+
),
=10-1,
=9.
=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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