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用递等式计算712÷9+19×512[45-0÷(13+25)]×58(3.8-1.8÷2)×0.32÷23-23÷2(115+217)×15×17(15-15×45)×724.

题目详情
用递等式计算
7
12
÷9+
1
9
×
5
12

[
4
5
-0÷(
1
3
+
2
5
)]×
5
8
(3.8-1.8÷2)×0.3
2
3
-
2
3
÷2
1
15
+
2
17
)×15×17
(15-15×
4
5
)×
7
24
用递等式计算
7
12
÷9+
1
9
×
5
12

[
4
5
-0÷(
1
3
+
2
5
)]×
5
8
(3.8-1.8÷2)×0.3
2
3
-
2
3
÷2
1
15
+
2
17
)×15×17
(15-15×
4
5
)×
7
24
用递等式计算
7
12
÷9+
1
9
×
5
12

[
4
5
-0÷(
1
3
+
2
5
)]×
5
8
用递等式计算
7
12
÷9+
1
9
×
5
12

7
12
÷9+
1
9
×
5
12
7
12
771212
1
9
×
5
12
1
9
1199
5
12
5
12
551212
[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

4
5
-0÷(
1
3
+
2
5
)]×
5
8
4
5
4455
1
3
+
2
5
)]×
5
8
1
3
1133
2
5
)]×
5
8
2
5
2255
5
8
5
8
5588 (3.8-1.8÷2)×0.3 2÷
2
3
-
2
3
÷2
(3.8-1.8÷2)×0.32÷
2
3
-
2
3
÷2
2
3
-
2
3
÷2
2
3
2233
2
3
÷2
2
3
2233 (
1
15
+
2
17
)×15×17
(15-15×
4
5
)×
7
24
1
15
+
2
17
)×15×17
1
15
+
2
17
)×15×17
1
15
111515
2
17
)×15×17
2
17
221717(15-15×
4
5
)×
7
24
4
5
)×
7
24
4
5
4455
7
24
7
24
772424
▼优质解答
答案和解析
(1)
7
12
÷9+
1
9
×
5
12

=
7
12
×
1
9
+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
7
12
777121212÷9+
1
9
×
5
12

=
7
12
×
1
9
+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
9
111999×
5
12

=
7
12
×
1
9
+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
5
12
555121212,
=
7
12
×
1
9
+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
7
12
777121212×
1
9
+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
9
111999+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
9
111999×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
5
12
555121212,
=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
7
12
777121212+
5
12
555121212)×
1
9

=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
9
111999,
=1×
1
9

=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
9
111999,
=
1
9


(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
9
111999;

(2)[
4
5
-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
4
5
444555-0÷(
1
3
+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
3
111333+
2
5
)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
2
5
222555)]×
5
8

=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
5
8
555888,
=
4
5
×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
4
5
444555×
5
8

=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
5
8
555888,
=
1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
2
111222;

(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷
2
3
-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
2
3
222333-
2
3
÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
2
3
222333÷2,
=3-
1
3

=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
3
111333,
=2
2
3


(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
2
3
222333;

(5)(
1
15
+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
15
111151515+
2
17
)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
2
17
222171717)×15×17,
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
1
15
111151515×15×17+
2
17
×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
2
17
222171717×15×17,
=17+30,
=47;

(6)(15-15×
4
5
)×
7
24

=(15-12)×
7
24

=3×
4
5
444555)×
7
24

=(15-12)×
7
24

=3×
7
24
777242424,
=(15-12)×
7
24

=3×
7
24
777242424,
=3×