题目内容

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
].

(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.
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