问题 解答题
用简便方法计算
3
8
×11-
3
8
×3
8
13
÷7+
1
7
×
6
13
1
3
-
1
6
+
1
4
)×12
11.58-(1.58+
5
11
答案

(1)

3
8
×11-
3
8
×3,

=

3
8
×(11-3),

=

3
8
×8,

=3;

(2)

8
13
÷7+
1
7
×
6
13

=

8
13
×
1
7
+
1
7
×
6
13

=(

8
13
+
6
13
)×
1
7

=

14
13
×
1
7

=

2
13

(3)(

1
3
-
1
6
+
1
4
)×12,

=

1
3
×12-
1
6
×
12+
1
4
×12,

=4-2+3,

=5;

(4)11.58-(1.58+

5
11
),

=11.58-1.58-

5
11

=10-

5
11

=9

6
11

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