题目内容

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
(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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