题目内容

怎样简便就怎样算.
1
5
×8÷
4
5

3
5
+
1
2
×
4
5

5
6
÷
2
3
÷
5
6

(
5
8
+
6
5
4
25

(
5
6
-
2
3
9
10

1-
7
9
÷
7
8
分析:(1)从左往右依次运算;
(2)先算乘法,再算加法;
(3)把除法改为乘法,约分计算;
(4)(5)先算括号内的,再算括号外的;
(6)先算除法,再算减法.
解答:解:(1)
1
5
×8÷
4
5

=
8
5
×
5
4

=2;

(2)
3
5
+
1
2
×
4
5

=
3
5
+
2
5

=1;

(3)
5
6
÷
2
3
÷
5
6

=
5
6
÷
5
6
÷
2
3

=1×
3
2

=
3
2


(4)(
5
8
+
6
5
)×
4
25

=
73
40
×
4
25

=
73
250


(5)(
5
6
-
2
3
)×
9
10

=
1
6
×
9
10

=
3
20


(6)1-
7
9
÷
7
8

=1-
7
9
×
8
7

=1-
8
9

=
1
9
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则.
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