题目内容
(2009?江安县模拟)计算下面各题.
8470-104×65
7.12×4-1.12÷0.25
72×(
-
)+10
(
+
-
)×3
1-
÷
1
×[(
+0.25)÷(
-
)].
8470-104×65
7.12×4-1.12÷0.25
72×(
5 |
9 |
5 |
12 |
(
1 |
6 |
1 |
9 |
1 |
12 |
1-
1 |
6 |
5 |
12 |
1
7 |
9 |
3 |
8 |
5 |
6 |
5 |
9 |
分析:(1)(2)根据整数和小数四则混合运算顺序解答;
(3)(4)用乘法分配律解答;
(5)(6)根据整数、分数和小数四则运算顺序解答.
(3)(4)用乘法分配律解答;
(5)(6)根据整数、分数和小数四则运算顺序解答.
解答:解:(1)8470-104×65,
=8470-6760,
=1710;
(2)7.12×4-1.12÷0.25,
=28.48-4.48,
=24;
(3)72×(
-
)+10,
=72×
-72×
+10,
=40-30+10,
=20;
(4)(
+
-
)×3,
=
×3+
×3-
×3,
=
+
-
,
=
+
-
,
=
,
(5)1-
÷
,
=1-
,
=
;
(6)1
×[(
+0.25)÷(
-
)],
=1
×[(
+0.25)÷(
-
)],
=1
×[
÷
],
=1
×
,
=4.
=8470-6760,
=1710;
(2)7.12×4-1.12÷0.25,
=28.48-4.48,
=24;
(3)72×(
5 |
9 |
5 |
12 |
=72×
5 |
9 |
5 |
12 |
=40-30+10,
=20;
(4)(
1 |
6 |
1 |
9 |
1 |
12 |
=
1 |
6 |
1 |
9 |
1 |
12 |
=
1 |
2 |
1 |
3 |
1 |
4 |
=
6 |
12 |
4 |
12 |
3 |
12 |
=
7 |
12 |
(5)1-
1 |
6 |
5 |
12 |
=1-
2 |
5 |
=
3 |
5 |
(6)1
7 |
9 |
3 |
8 |
5 |
6 |
5 |
9 |
=1
7 |
9 |
3 |
8 |
5 |
6 |
5 |
9 |
=1
7 |
9 |
5 |
8 |
5 |
18 |
=1
7 |
9 |
9 |
4 |
=4.
点评:本题主要考查了学生对于四则混合运算的把握,注意解答过程中的简算.
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