题目内容

计算下面各题.(能简算的要简算)
10-
2
3
×
9
10
1
9
+
1
6
)×
8
25
5
9
×
6
25
×
3
8
1
4
+
1
8
)×24
7
5
×
6
5
×
11
2
×
10
11
5
7
+
2
7
×2
14
5
×
3
2
+
14
5
×
7
2
16×
2
3
×(9×
1
2
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.
解答:解:(1)10-
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
)×24,
=
1
4
×24+
1
8
×24,
=6+3,
=9;
(5)
7
5
×
6
5
×
11
2
×
10
11
=8
2
5
(6)5×
5
7
+
2
7
×2,
=
25
7
+
4
7

=4
1
7


(7)
14
5
×
3
2
+
14
5
×
7
2

=
14
5
×(
3
2
+
7
2
),
=
14
5
×5,
=14;

(8)16×
2
3
×(9×
1
2
),
=16×
2
3
×9×
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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