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怎样简便就怎样算.(1)3-712-512(2)57×38+58×57(3)815×516+527÷109(4)18×(49+56)

题目详情
怎样简便就怎样算.
(1)3-
7
12
-
5
12

(2)
5
7
×
3
8
+
5
8
×
5
7

(3)
8
15
×
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6

7
12
-
5
12

(2)
5
7
×
3
8
+
5
8
×
5
7

(3)
8
15
×
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6
7
12
771212
5
12

(2)
5
7
×
3
8
+
5
8
×
5
7

(3)
8
15
×
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6
5
12
551212
5
7
×
3
8
+
5
8
×
5
7

(3)
8
15
×
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6
5
7
5577
3
8
+
5
8
×
5
7

(3)
8
15
×
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6
3
8
3388
5
8
×
5
7

(3)
8
15
×
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6
5
8
5588
5
7

(3)
8
15
×
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6
5
7
5577
8
15
×
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6
8
15
881515
5
16
+
5
27
÷
10
9

(4)18×(
4
9
+
5
6
5
16
551616
5
27
÷
10
9

(4)18×(
4
9
+
5
6
5
27
552727
10
9

(4)18×(
4
9
+
5
6
10
9
101099
4
9
+
5
6
4
9
4499
5
6
5
6
5566
▼优质解答
答案和解析
(1)3-
7
12
-
5
12

=3-(
7
12
+
5
12

=3-1
=2;

(2)
5
7
×
3
8
+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
7
12
777121212-
5
12

=3-(
7
12
+
5
12

=3-1
=2;

(2)
5
7
×
3
8
+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
12
555121212
=3-(
7
12
+
5
12

=3-1
=2;

(2)
5
7
×
3
8
+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
7
12
777121212+
5
12

=3-1
=2;

(2)
5
7
×
3
8
+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
+
5
12
555121212)
=3-1
=2;

(2)
5
7
×
3
8
+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
7
555777×
3
8
+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
3
8
333888+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
8
555888×
5
7

=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
7
555777
=
5
7
×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
7
555777×(
3
8
+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
3
8
333888+
5
8

=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
8
555888)
=
5
7
×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
7
555777×1
=
5
7


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
7
555777;

(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
8
15
888151515×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
16
555161616+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
27
555272727÷
10
9

=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
10
9
101010999
=
1
6
+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
1
6
111666+
1
6

=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
1
6
111666
=
1
3


(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
1
3
111333;

(4)18×(
4
9
+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
4
9
444999+
5
6

=18×
4
9
+18×
5
6

=8+15
=23.
5
6
555666)
=18×
4
9
+18×
5
6

=8+15
=23.
4
9
444999+18×
5
6

=8+15
=23.
5
6
555666
=8+15
=23.