问题 解答题
怎样算简便就怎样算.
4
9
×
1
5
÷
4
5
4-
5
11
-
6
11
1
8
×58+42÷8;
36×(
2
3
+
1
6
-
3
4
);
(15-14×
4
7
)×
8
21
4
5
÷
5
8
-
1
2
÷
5
8
答案

(1)

4
9
×
1
5
÷
4
5

=

4
9
×
1
5
×
5
4

=

1
9

(2)4-

5
11
-
6
11

=4-(

5
11
+
6
11
),

=4-1,

=3;

(3)

1
8
×58+42÷8

=

1
8
×58+42×
1
8

=(58+42)×

1
8

=100×

1
8

=12.5;

(4)36×(

2
3
+
1
6
-
3
4

=36×

2
3
+36×
1
6
-36×
3
4

=24+6-27,

=3;

(5)(15-14×

4
7
)×
8
21

=(15-8)×

8
21

=7×

8
21

=

8
3

(6)

4
5
÷
5
8
-
1
2
÷
5
8

=

4
5
×
8
5
-
1
2
×
8
5

=(

4
5
-
1
2
)×
8
5

=

3
10
×
8
5

=

12
25

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