题目内容

(2008?宜宾)
计算下面各题.
6760÷13+17×25
4.82-5.2÷0.8×0.6 (
7
12
-
1
2
11
24
(
1
3
+
1
2
)÷(2-
2
3
)
(
5
6
-
5
8
×
4
5
1
3
8
15
×[
5
6
÷(
7
9
-
1
3
)]
分析:(1)按整数四则混合运算的顺序计算;
(2)按小数四则混合运算的顺序计算;
(3)利用乘法的分配律计算;
(4)(5)(6)按分数四则混合运算的顺序计算.
解答:解:(1)6760÷13+17×25,
=520+425,
=945;
(2)4.82-5.2÷0.8×0.6,
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(3)(
7
12
-
1
2
11
24

=(
7
12
-
1
2
)×
24
11

=
7
12
×
24
11
-
1
2
×
24
11

=
14
11
-
12
11

=
2
11

(4)(
1
3
+
1
2
)÷(2-
2
3
)

=
5
6
÷1
1
3

=
5
8

(5)(
5
6
-
5
8
×
4
5
÷
1
3

=(
5
6
-
1
2
÷
1
3

=
1
3
÷
1
3

=1;
(6)
8
15
×[
5
6
÷(
7
9
-
1
3
)]

=
8
15
×(
5
6
÷
4
9
),
=
8
15
×
15
8

=1.
点评:此题考查了乘法的分配律和按整数、小数、分数的四则混合运算的顺序计算.
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