用简便方法计算下面各题.118-( 56+38) ...

用简便方法计算下面各题.118-( 56+38) 59+411+611+49 5-37-47.
2024-12-29 03:38:26
推荐回答(1个)
回答1:

(1)

11
8
-( 
5
6
+
3
8
),
=
11
8
-
3
8
-
5
6

=1-
5
6

=
1
6

 
(2)
5
9
+
4
11
+
6
11
+
4
9

=(
5
9
+
4
9
)+(
4
11
+
6
11
),
=1+
10
11

=1
10
11


(3)5-
3
7
-
4
7

=5-(
3
7
+
4
7
),
=5-1,
=4.