题目内容
(2013?海珠区)计算下面各题,能用简便算法的就用简便算法
|
| ||||||||||||
5.58-
|
5÷[(
|
分析:(1)先算乘法,再算除法;
(2)根据乘法分配律进行计算;
(3)先算除法,再根据连减的性质进行计算;
(4)先算加法,再算乘法,最后算除法.
(2)根据乘法分配律进行计算;
(3)先算除法,再根据连减的性质进行计算;
(4)先算加法,再算乘法,最后算除法.
解答:解:
(1)
×
÷
,
=
÷
,
=
;
(2)
÷6+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(3)5.58-
÷
-
,
=5.58-
-
,
=5.58-(
+
),
=5.58-1,
=4.58;
(4)5÷[(
+
)×
],
=5÷[
×
],
=5÷
,
=25.
(1)
4 |
9 |
15 |
16 |
5 |
6 |
=
5 |
12 |
5 |
6 |
=
1 |
2 |
(2)
9 |
20 |
1 |
20 |
1 |
6 |
=
9 |
20 |
1 |
6 |
1 |
20 |
1 |
6 |
=(
9 |
20 |
1 |
20 |
1 |
6 |
=
1 |
2 |
1 |
6 |
=
1 |
12 |
(3)5.58-
7 |
30 |
14 |
25 |
7 |
12 |
=5.58-
5 |
12 |
7 |
12 |
=5.58-(
5 |
12 |
7 |
12 |
=5.58-1,
=4.58;
(4)5÷[(
2 |
3 |
1 |
5 |
3 |
13 |
=5÷[
13 |
15 |
3 |
13 |
=5÷
1 |
5 |
=25.
点评:此题主要考查分数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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