问题 解答题
计算下面各题,能用简便算法的要用简便算法.
(1)10-
8
9
×
3
8
÷
3
4
(2)2-
5
11
-
6
11
(3)
3
4
×
5
7
-
3
4
×
1
7
(4)
1
4
÷(3-
5
13
-
8
13
答案

(1)10-

8
9
×
3
8
÷
3
4

=10-

1
3
÷
3
4

=10-

4
9

=9

5
9

(2)2-

5
11
-
6
11

=2-(

5
11
+
6
11
),

=2-1,

=1;

(3)

3
4
×
5
7
-
3
4
×
1
7

=

3
4
×(
5
7
-
1
7
),

=

3
4
×
4
7

=

3
7

(4)

1
4
÷(3-
5
13
-
8
13
),

=

1
4
÷[3-(
5
13
+
8
13
)],

=

1
4
÷[3-1],

=

1
4
÷2,

=

1
8

单项选择题
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