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用简便方法计算.1112+58+18+1128-427-2327178-35-2581723+514-61723+34.

题目详情
用简便方法计算.
11
12
+
5
8
+
1
8
+
1
12
        
8-
4
27
-
23
27

1
7
8
-
3
5
-
2
5
        
8
17
23
+5
1
4
-6
17
23
+
3
4
▼优质解答
答案和解析
(1)
11
12
+
5
8
+
1
8
+
1
12

=(
11
12
+
1
12
)+(
5
8
+
1
8

=1+
3
4

=1
3
4


(2)8-
4
27
-
23
27

=8-(
4
27
+
23
27

=8-1
=7;

(3)1
7
8
-
3
5
-
2
5

=1
7
8
-(
3
5
+
2
5

=1
7
8
-1
=
7
8


(4)8
17
23
+5
1
4
-6
17
23
+
3
4

=(8
17
23
-6
17
23
)+(5
1
4
+
3
4

=2+6
=8.