题目内容
(2012?仙游县模拟)计算下面各题,怎样算简便就怎样算.
+
+
+
4.1-2.56÷(0.18+0.62)
36×(
-
+
)
7 |
13 |
5 |
7 |
6 |
13 |
2 |
7 |
4.1-2.56÷(0.18+0.62)
36×(
2 |
3 |
1 |
4 |
1 |
12 |
分析:(1)运用加法交换律、结合律简算;
(2)先算小括号里面的加法,再算括号外的除法,最后算减法;
(3)运用乘法分配律简算.
(2)先算小括号里面的加法,再算括号外的除法,最后算减法;
(3)运用乘法分配律简算.
解答:解:(1)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(2)4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;
(3)36×(
-
+
),
=36×
-36×
+36×
,
=24-9+3,
=15+3,
=18.
7 |
13 |
5 |
7 |
6 |
13 |
2 |
7 |
=(
7 |
13 |
6 |
13 |
2 |
7 |
5 |
7 |
=1+1,
=2;
(2)4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;
(3)36×(
2 |
3 |
1 |
4 |
1 |
12 |
=36×
2 |
3 |
1 |
4 |
1 |
12 |
=24-9+3,
=15+3,
=18.
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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