题目内容
计算下面各题.(能简算的要简算) 10-
|
(
|
|
(
| ||||||||||||||||||||||||
|
5×
|
|
16×
|
分析:(1)先算乘法,再算减法;
(2)先算括号里面的,再算括号外面的;
(3)(5)(8)先约分,再计算即可;
(4)(7)根据乘法分配律简便计算;
(6)先算乘法,再算加法.
(2)先算括号里面的,再算括号外面的;
(3)(5)(8)先约分,再计算即可;
(4)(7)根据乘法分配律简便计算;
(6)先算乘法,再算加法.
解答:解:(1)10-
×
,
=10-
,
=9
;
(2)(
+
)×
,
=
×
,
=
;
(3)
×
×
=
;
(4)(
+
)×24,
=
×24+
×24,
=6+3,
=9;
(6)5×
+
×2,
=
+
,
=4
;
(7)
×
+
×
,
=
×(
+
),
=
×5,
=14;
(8)16×
×(9×
),
=16×
×9×
,
=48.
2 |
3 |
9 |
10 |
=10-
3 |
5 |
=9
2 |
5 |
(2)(
1 |
9 |
1 |
6 |
8 |
25 |
=
5 |
18 |
8 |
25 |
=
4 |
45 |
(3)
5 |
9 |
6 |
25 |
3 |
8 |
1 |
20 |
(4)(
1 |
4 |
1 |
8 |
=
1 |
4 |
1 |
8 |
=6+3,
=9;
(5)
|
5 |
7 |
2 |
7 |
=
25 |
7 |
4 |
7 |
=4
1 |
7 |
(7)
14 |
5 |
3 |
2 |
14 |
5 |
7 |
2 |
=
14 |
5 |
3 |
2 |
7 |
2 |
=
14 |
5 |
=14;
(8)16×
2 |
3 |
1 |
2 |
=16×
2 |
3 |
1 |
2 |
=48.
点评:考查了分数的四则混合运算和分数的简便计算,注意灵活运用运算律简便计算.
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