题目内容

计算下列各题,能简算的要简算
2
5
+
4
5
×
7
4
       
5
8
×(
3
4
+
9
20
)      
12
13
×14-
12
13
48×(
5
6
-
3
8
)      
1
4
+
3
68
×
51
5
       
9
20
-
2
15
+
11
20
(1)
2
5
+
4
5
×
7
4

=
2
5
+
7
5

=
9
5


(2)
5
8
×(
3
4
+
9
20
),
=
5
8
×
24
20

=
3
4


(3)
12
13
×14-
12
13

=
12
13
×(14-1),
=
12
13
×13,
=12;

(4)48×(
5
6
-
3
8
),
=48×
5
6
-48×
3
8

=40-18,
=22;

(5)
1
4
+
3
68
×
51
5

=
1
4
+
9
20

=
7
10


(6)
9
20
-
2
15
+
11
20

=
9
20
+
11
20
-
2
15

=1-
2
15

=
13
15
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