试题:
简便计算:
(1)-9
8
9
×81
                      
(2)-52×
3
2
-(-25)×
5
8
-(-5)2÷8

答案:

我来补答
(1)原式=(
1
9
-10)×81
=
1
9
×81-10×81
=9-810
=-801;

(2)原式=-25×
3
2
+25×
5
8
-25÷8
=-
75
2
+
125
8
-
25
8

=-25,
 
 
展开全文阅读
剩余:2000
这些题目你会做吗?