问题 解答题
递等式计算:(能简便的要简便)
3
1
10
×7
1
2
+1÷
2
7
)÷
15
7
3
8
×
5
27
11
18
×
5
9
+
5
9
×
7
18
2.35+
2
9
÷
1
9
+2.35
1
4
+
1
2
)÷(
2
3
-
2
5
3
8
+
1
4
)÷
3
16
3
4
+
1
6
-
3
24
)÷
1
24
25÷(
1
4
-
1
9
答案

(1)3

1
10
×7,

=(3×7)+(

1
10
×7),

=21+

7
10

=21

7
10

(2)(

1
2
+1÷
2
7
)÷
15
7

=(

1
2
+1×
7
2
)×
7
15

=(

1
2
+
7
2
)×
7
15

=4×

7
15

=

28
15

=1

13
15

(3)9×

3
8
×
5
27

=9×

3
8
×
5
27

=

5
8

(4)

11
18
×
5
9
+
5
9
×
7
18

=(

11
18
+
7
18
)×
5
9

=1×

5
9

=

5
9

(5)2.35+

2
9
÷
1
9
+2.35,

=2.35+

2
9
×
9
1
+2.35,

=2.35+2+2.35,

=6.7;

(6)(

1
4
+
1
2
)÷(
2
3
-
2
5
),

=

3
4
÷
4
15

=

3
4
×
15
4

=

45
16

=2

13
16

(7)(

3
8
+
1
4
÷
3
16

=(

3
8
+
1
4
)×
16
3

=

3
8
×
16
3
+
1
4
×
16
3

=2+

4
3

=3

1
3

(8)(

3
4
+
1
6
-
3
24
÷
1
24

=

3
4
×24+
1
6
×24-
3
24
×24,

=18+4-3,

=19;

(9)25÷(

1
4
-
1
9
),

=25÷(

9
36
-
4
36
),

=25×

36
5

=180.

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