问题 解答题
能简算的要简算.
7
10
÷8÷
14
5
1
4
×
8
9
÷
9
10
2
3
×
8
5
+
1
3
÷
5
8
1
4
-
1
20
)×40    
3
4
×[(
7
15
-
1
5
)÷
2
3
]
(13+
1
9
)×
9
13
答案

(1)

7
10
÷8÷
14
5

=

7
10
×
1
8
×
5
14

=

1
32

(2)

1
4
×
8
9
÷
9
10

=

1
4
×
8
9
×
10
9

=

20
81

(3)

2
3
×
8
5
+
1
3
÷
5
8

=

2
3
×
8
5
+
1
3
×
8
5

=(

2
3
+
1
3
)×
8
5

=1×

8
5

=

8
5

(4)(

1
4
-
1
20
)×40,

=

1
4
×40-
1
20
×40,

=10-2,

=8;

(5)

3
4
×[(
7
15
-
1
5
)÷
2
3
],

=

3
4
×[
4
15
×
3
2
],

=

3
4
×
2
5

=

3
10

(6)(13+

1
9
)×
9
13

=13×

9
13
+
1
9
×
9
13

=9+

1
13

=9

1
13

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