试题:
计算下列各题(能简算的要简算)
2
3
+
4
15
)×30
3
8
×7+3÷
8
3
2
3
+(
4
7
+
1
2
)×
7
25
1
2
-
1
7
×
9
10
+
5
6
[1-(
1
4
+
3
8
)]÷
1
4

答案:

我来补答
(1)(
2
3
+
4
15
)×30,
=
2
3
×30+
4
15
×30,
=20+8,
=28;

(2)
3
8
×7+3÷
8
3

=
3
8
×7+3×
3
8

=
3
8
×(7+3),
=
3
8
×10,
=
15
4


(3)
2
3
+(
4
7
+
1
2
)×
7
25

=
2
3
+
15
14
×
7
25

=
2
3
+
3
10

=
29
30


(4)
1
2
-
1
7
×
9
10
+
5
6

=
1
2
-
9
70
+
5
6

=
1
2
+
5
6
-
9
70

=
4
3
-
9
70

=
253
210


(5)[1-(
1
4
+
3
8
)]÷
1
4

=[1-
5
8
1
4

=
3
8
÷
1
4

=
3
2
 
 
展开全文阅读
剩余:2000
这些题目你会做吗?