问题 解答题
用简便方法计算.
11-
5
12
-
7
12
3
4
+
1
3
)×12
2
9
×
4
13
+
4
13
÷
9
7
答案

(1)11-

5
12
-
7
12

=11-(

5
12
+
7
12
),

=11-1,

=10;

(2)(

3
4
+
1
3
)×12,

=

3
4
×12+
1
3
×12,

=9+4,

=13;

(3)

2
9
×
4
13
+
4
13
÷
9
7

=

2
9
×
4
13
+
4
13
×
7
9

=(

2
9
+
7
9
)×
4
13

=1×

4
13

=

4
13

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