题目内容

计算下面各题.
49200÷24-1567 2-
9
10
×
4
15
)÷
11
10
5
6
×
8
15
-
3
20
÷
9
10
13
12
-
5
6
)÷(
3
8
+
1
6
5
6
-
8
15
×(
2
3
-
1
4
9
10
÷[
1
2
×(
6
5
-
3
10
)].
分析:(1)先算除法,再算减法;
(2)先算乘法,再算减法,最后算除法;
(3)先算乘法和除法,再算减法;
(4)先算减法和加法,再算除法;
(5)先算小括号里面的减法,再算乘法,最后算括号外面的减法;
(6)先算减法,再算乘法,最后算除法.
解答:解:
(1)49200÷24-1567,
=2050-1567,
=483;

(2)(2-
9
10
×
4
15
)÷
11
10

=(2-
6
25
)÷
11
10

=1
19
25
÷
11
10

=
8
5


(3)
5
6
×
8
15
-
3
20
÷
9
10

=
4
9
-
1
6

=
5
18


(4)(
13
12
-
5
6
)÷(
3
8
+
1
6
),
=
1
4
÷
13
24

=
6
13


(5)
5
6
-
8
15
×(
2
3
-
1
4
),
=
5
6
-
8
15
×
5
12

=
5
6
-
2
9

=
11
18


(6)
9
10
÷[
1
2
×(
6
5
-
3
10
)],
=
9
10
÷[
1
2
×
9
10
],
=
9
10
÷
9
20

=2.
点评:考查了四则混合运算.注意运算顺序和运算法则,然后再进一步计算.
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