问题 解答题
下面各题,怎样算简便就怎样算
(1)
15
16
-(
7
12
+
1
6
)×
1
2
(2)(1-75%)÷(1+
1
4
(3)
5
17
×
9
24
+
7
17
×
9
24
(4)(
2
5
-
2
5
÷2)×
5
3
(5)59÷[1÷(
1
10
-9%)]
(6)
1
5
×79+21×0.2
答案

(1)

15
16
-(
7
12
+
1
6
)×
1
2

=

15
16
-
3
4
×
1
2

=

15
16
-
3
8

=

9
16

(2)(1-75%)÷(1+

1
4
),

=

1
4
÷
5
4

=

1
5

(3)

5
17
×
9
24
+
7
17
×
9
24

=(

5
17
+
7
17
)×
9
24

=

12
17
×
9
24

9
34

(4)(

2
5
-
2
5
÷2)×
5
3

=(

2
5
-
1
5
)×
5
3

=

1
5
×
5
3

=

1
3

(5)59÷[1÷(

1
10
-9%)],

=59÷[1÷0.01],

=59÷100,

=0.59;

(6))

1
5
×79+21×0.2,

=(79+21)×0.2,

=100×0.2,

=20.

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