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计算(能简便的用简便方法计算).89-14+5810-718-1118712-(112+12)15+310+215.

题目详情
计算(能简便的用简便方法计算).
8
9
-
1
4
+
5
8

10-
7
18
-
11
18

7
12
-(
1
12
+
1
2
)                                      
1
5
+
3
10
+
2
15
▼优质解答
答案和解析
(1)
8
9
-
1
4
+
5
8

=
23
36
+
5
8

=1
19
72


(2)10-
7
18
-
11
18

=10-(
7
18
+
11
18

=10-1
=9;

(3)
7
12
-(
1
12
+
1
2

=
7
12
-
7
12

=0;
                                      
(4)
1
5
+
3
10
+
2
15

=
1
2
+
2
15

=
19
30