题目内容
(2010?江都市模拟)计算,能简单的要简算
48×(
|
|
632-486÷18+395 | ||||||||||||||||||||||
[
|
0.75×74+
|
|
分析:(1)运用乘法分配律解答,
(2)运用加法交换律,以及减法简便运算解答,
(3)先算第二级运算,再算第一级运算解答,
(4)根据四则运算顺序解答,
(5)运用乘法分配律解答,
(6)化
=1-
,
=
-
…
=
-
,
=
-
解答.
(2)运用加法交换律,以及减法简便运算解答,
(3)先算第二级运算,再算第一级运算解答,
(4)根据四则运算顺序解答,
(5)运用乘法分配律解答,
(6)化
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 32 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
| 1 |
| 32 |
| 1 |
| 64 |
解答:解:(1)48×(
-
),
=48×
-48×
,
=12-8,
=4;
(2)
-
-
+
,
=(
+
)-(
+
),
=5-4,
=1;
(3)632-486÷18+395,
=632-27+395,
=605+395,
=1000;
(4)[
-(
+
)]÷
,
=[
-
]÷
,
=0÷
,
=0;
(5)0.75×74+
×25+75%,
=0.75×(74+25+1),
=0.75×100,
=75;
(6)
+
+
+
+
+
,
=1-
+
-
+…+
-
,
=1-
,
=
.
| 1 |
| 4 |
| 1 |
| 6 |
=48×
| 1 |
| 4 |
| 1 |
| 6 |
=12-8,
=4;
(2)
| 7 |
| 8 |
| 13 |
| 4 |
| 3 |
| 4 |
| 33 |
| 8 |
=(
| 7 |
| 8 |
| 33 |
| 8 |
| 13 |
| 4 |
| 3 |
| 4 |
=5-4,
=1;
(3)632-486÷18+395,
=632-27+395,
=605+395,
=1000;
(4)[
| 1 |
| 2 |
| 1 |
| 18 |
| 4 |
| 9 |
| 17 |
| 23 |
=[
| 1 |
| 2 |
| 1 |
| 2 |
| 17 |
| 23 |
=0÷
| 17 |
| 23 |
=0;
(5)0.75×74+
| 3 |
| 4 |
=0.75×(74+25+1),
=0.75×100,
=75;
(6)
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 64 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 32 |
| 1 |
| 64 |
=1-
| 1 |
| 64 |
=
| 63 |
| 64 |
点评:本题主要考查学生对于四则运算顺序,以及四则运算简便算法的掌握.
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