题目内容

3
4
+
3
20
×15÷
3
5
1
6
+
1
8
)×24×
1
9
18×(
1
2
+6×
7
9
9
14
÷(
5
6
-
3
4
)×
7
24
[15×(50%+
1
3
)]÷
5
8
9
20
÷[
1
2
×(
2
5
+
4
5
)].
分析:(1)先算乘法,再算除法,最后算加法;
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算;
(4)先算减法,再算除法,最后算乘法;
(5)先算加法,再算乘法,最后算除法;
(6)先算加法,再算乘法,最后算除法.
解答:解:
(1)
3
4
+
3
20
×15÷
3
5

=
3
4
+
9
4
÷
3
5

=
3
4
+
15
4

=
9
2


(2)(
1
6
+
1
8
)×24×
1
9

=
1
6
×24×
1
9
+
1
8
×24×
1
9

=
4
9
+
1
3

=
7
9


(3)18×(
1
2
+6×
7
9
),
=18×
1
2
+18×6×
7
9

=9+84,
=93;

(4)
9
14
÷(
5
6
-
3
4
)×
7
24

=
9
14
÷
1
12
×
7
24

=
54
7
×
7
24

=
9
4


(5)[15×(50%+
1
3
)]÷
5
8

=[15×
5
6
5
8

=
25
2
÷
5
8

=20;

(6)
9
20
÷[
1
2
×(
2
5
+
4
5
)],
=
9
20
÷[
1
2
×
6
5
],
=
9
20
÷
3
5

=
3
4
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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