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下列各题怎样简便就怎样算(1)57×38+58×57(2)34+12−712(3)815×516+527÷109(4)18×8÷18×8(5)15÷[(23+15)×113](6)2-613÷926−23.

题目详情
下列各题怎样简便就怎样算
(1)
5
7
×
3
8
+
5
8
×
5
7
(2)
3
4
+
1
2
7
12
(3)
8
15
×
5
16
+
5
27
÷
10
9
(4)
1
8
×8÷
1
8
×8
(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
]
(6)2-
6
13
÷
9
26
2
3
(1)
5
7
×
3
8
+
5
8
×
5
7
(2)
3
4
+
1
2
7
12
(3)
8
15
×
5
16
+
5
27
÷
10
9
(4)
1
8
×8÷
1
8
×8
(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
]
(6)2-
6
13
÷
9
26
2
3
(1)
5
7
×
3
8
+
5
8
×
5
7
(2)
3
4
+
1
2
7
12
(3)
8
15
×
5
16
+
5
27
÷
10
9
(1)
5
7
×
3
8
+
5
8
×
5
7
5
7
×
3
8
+
5
8
×
5
7
5
7
5577
3
8
3388
5
8
×
5
7
5
8
5588
5
7
5577(2)
3
4
+
1
2
7
12
3
4
+
1
2
7
12
3
4
3344
1
2
1122
7
12
771212(3)
8
15
×
5
16
+
5
27
÷
10
9
8
15
×
5
16
+
5
27
÷
10
9
8
15
881515
5
16
551616
5
27
552727
10
9
101099 (4)
1
8
×8÷
1
8
×8
(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
]
(6)2-
6
13
÷
9
26
2
3
(4)
1
8
×8÷
1
8
×8
1
8
×8÷
1
8
×8
1
8
1188
1
8
1188(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
]
1
5
÷[(
2
3
+
1
5
)×
1
13
]
1
5
1155
2
3
+
1
5
)×
1
13
]
2
3
2233
1
5
1155
1
13
]
1
13
111313(6)2-
6
13
÷
9
26
2
3
6
13
÷
9
26
2
3
6
13
661313
9
26
992626
2
3
2233
▼优质解答
答案和解析
(1)
5
7
×
3
8
+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8
),
=
5
7
×1,
=
5
7


(2)
3
4
+
1
2
7
12

=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
5
7
555777×
3
8
333888+
5
8
×
5
7

=
5
7
×(
3
8
+
5
8
),
=
5
7
×1,
=
5
7


(2)
3
4
+
1
2
7
12

=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
5
8
555888×
5
7
555777,
=
5
7
×(
3
8
+
5
8
),
=
5
7
×1,
=
5
7


(2)
3
4
+
1
2
7
12

=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
5
7
555777×(
3
8
+
5
8
),
=
5
7
×1,
=
5
7


(2)
3
4
+
1
2
7
12

=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
3
8
333888+
5
8
),
=
5
7
×1,
=
5
7


(2)
3
4
+
1
2
7
12

=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
+
5
8
555888),
=
5
7
×1,
=
5
7


(2)
3
4
+
1
2
7
12

=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
5
7
555777×1,
=
5
7


(2)
3
4
+
1
2
7
12

=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
5
7
555777;

(2)
3
4
+
1
2
7
12

=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
3
4
333444+
1
2
111222−
7
12
777121212,
=
5
4
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
5
4
555444
7
12

=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
7
12
777121212,
=
2
3


(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
2
3
222333;

(3)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
8
15
888151515×
5
16
555161616+
5
27
555272727÷
10
9
101010999,
=
1
6
+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
6
111666+
1
6

=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
+
1
6
111666,
=
1
3


(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
3
111333;

(4)
1
8
×8÷
1
8
×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
8
111888×8÷
1
8
111888×8,
=
1
8
÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
8
111888÷
1
8
×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
÷
1
8
111888×8×8,
=64;

(5)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
5
111555÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
2
3
222333+
1
5
111555)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
13
111131313],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
5
111555÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
13
15
131313151515×
1
13
],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
13
111131313],
=
1
5
÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
5
111555÷
1
15

=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
1
15
111151515,
=3;

(6)2-
6
13
÷
9
26
2
3

=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
6
13
666131313÷
9
26
999262626−
2
3
222333,
=2-
4
3
2
3

=2-(
4
3
+
2
3
),
=0.
4
3
444333
2
3

=2-(
4
3
+
2
3
),
=0.
2
3
222333,
=2-(
4
3
+
2
3
),
=0.
4
3
444333+
2
3
),
=0.
+
2
3
222333),
=0.