问题 解答题
计算下列各题,能简算的要简算
1
3
+
1
4
-
1
24
)×24
3-
3
2
÷
21
10
-
2
7
3
4
×
1
7
+
1
4
÷7
19÷[(
1
5
+
3
4
)×
5
6
].
答案

(1)(

1
3
+
1
4
-
1
24
)×24,

=

1
3
×24+
1
4
×24-
1
24
×24,

=8+6-1,

=13;

(2)3-

3
2
÷
21
10
-
2
7

=3-

5
7
-
2
7

=3-(

5
7
+
2
7
),

=3-1,

=2;

(3)

3
4
×
1
7
+
1
4
÷7,

=

3
4
×
1
7
+
1
4
×
1
7

=(

3
4
+
1
4
)×
1
7

=1×

1
7

=

1
7

(4)19÷[(

1
5
+
3
4
)×
5
6
],

=19÷[

19
20
×
5
6
],

=19÷

19
24

=24.

单项选择题
单项选择题