问题 解答题
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
答案

(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.

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