问题 解答题
计算,能简算的要简算
4
7
×
7
12
÷
1
4
4
5
×24+
4
5
11
18
-
5
12
+
2
9
)÷
1
36
(5-
3
4
×
4
9
)÷
7
8
21
13
-(
53
90
+
8
13
)-
37
90
20-
7
8
÷
21
40
×
1
5
答案

(1)

4
7
×
7
12
÷
1
4

=

4
7
×
7
12
×4,

=

4
3

(2)

4
5
×24+
4
5

=

4
5
×(24+1),

=

4
5
×25,

=20;

(3)(

11
18
-
5
12
+
2
9
)÷
1
36

=(

11
18
-
5
12
+
2
9
)×36,

=

11
18
×36-
5
12
×36+
2
9
×36,

=22-15+8,

=15;

(4)(5-

3
4
×
4
9
)÷
7
8

=(5-

1
3
)÷
7
8

=

14
3
×
8
7

=

16
3

(5)

21
13
-(
53
90
+
8
13
)-
37
90

=

21
13
-
53
90
-
8
13
-
37
90

=(

21
13
-
8
13
)-(
53
90
+
37
90
),

=1-1,

=0;

(6)20-

7
8
÷
21
40
×
1
5

=20-

7
8
×
40
21
×
1
5

=20-

1
3

=19

2
3

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