问题 解答题
用你喜欢的方式计算
11
18
-
2
5
-
1
5
2-
5
12
-
7
12
4
15
-(
4
15
-
1
7
5
8
+(
4
5
-
1
10
答案

11
18
-
2
5
-
1
5

=

11
18
-(
2
5
+
1
5
),

=

11
18
-
3
5

=

55
90
-
54
90

=

1
90

②2-

5
12
-
7
12

=2-(

5
12
+
7
12
),

=2-1,

=1;

4
15
-(
4
15
-
1
7
),

=

4
15
-
4
15
+
1
7

=

1
7

5
8
+(
4
5
-
1
10
),

=

5
8
+
7
10

=

53
40

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