题目内容
计算下面各题能简算的要简便计算.
32÷(11.08-1.48)×0.8
11.1×3.58+11.1×5.42
-
+
3
+
-
+
.
32÷(11.08-1.48)×0.8
11.1×3.58+11.1×5.42
17 |
20 |
3 |
5 |
5 |
6 |
3
3 |
5 |
7 |
11 |
3 |
5 |
4 |
11 |
分析:(1)先算小括号里面的减法,再算括号外的除法,最后算括号外的乘法;
(2)运用乘法分配律简算;
(3)按照从左到右的顺序计算;
(4)运用加法交换律和结合律简算.
(2)运用乘法分配律简算;
(3)按照从左到右的顺序计算;
(4)运用加法交换律和结合律简算.
解答:解:(1)32÷(11.08-1.48)×0.8,
=32÷9.6×0.8,
=
×0.8,
=
;
(2)11.1×3.58+11.1×5.42,
=11.1×(3.58+5.42),
=11.1×9,
=99.9;
(3)
-
+
,
=
+
,
=
;
(4)3
+
-
+
,
=(3
-
)+(
+
),
=3+1,
=4.
=32÷9.6×0.8,
=
10 |
3 |
=
8 |
3 |
(2)11.1×3.58+11.1×5.42,
=11.1×(3.58+5.42),
=11.1×9,
=99.9;
(3)
17 |
20 |
3 |
5 |
5 |
6 |
=
1 |
4 |
5 |
6 |
=
13 |
12 |
(4)3
3 |
5 |
7 |
11 |
3 |
5 |
4 |
11 |
=(3
3 |
5 |
3 |
5 |
4 |
11 |
7 |
11 |
=3+1,
=4.
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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