题目内容
计算,能简算的要简算:
|
|
24×(
| ||||||||||||||||||
100×
|
(
|
1
|
分析:(1)运用乘法交换律解答,
(2)(5)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(3)(4)运用乘法分配律解答,
(6)依据减法性质解答.
(2)(5)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(3)(4)运用乘法分配律解答,
(6)依据减法性质解答.
解答:解:(1)
×
×5,
=
×5×
,
=3×
,
=1
;
(2)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=3;
(3)24×(
+
-
),
=24×
+24×
-24×
,
=16+4-18,
=2;
(4)100×
,
=101×
-1×
,
=100-
,
=99
;
(5)(
+
×
)÷
,
=(
+
)÷
,
=
÷
,
=
;
(6)1
-
÷
-
,
=1
-
-
,
=1
-(
+
),
=1
-1,
=
.
| 3 |
| 5 |
| 4 |
| 7 |
=
| 3 |
| 5 |
| 4 |
| 7 |
=3×
| 4 |
| 7 |
=1
| 5 |
| 7 |
(2)
| 4 |
| 5 |
| 1 |
| 3 |
| 2 |
| 5 |
| 4 |
| 11 |
=
| 4 |
| 5 |
| 11 |
| 15 |
| 4 |
| 11 |
=
| 4 |
| 5 |
| 4 |
| 15 |
=3;
(3)24×(
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=24×
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=16+4-18,
=2;
(4)100×
| 100 |
| 101 |
=101×
| 100 |
| 101 |
| 100 |
| 101 |
=100-
| 100 |
| 101 |
=99
| 1 |
| 101 |
(5)(
| 2 |
| 3 |
| 4 |
| 15 |
| 5 |
| 6 |
| 20 |
| 21 |
=(
| 2 |
| 3 |
| 2 |
| 9 |
| 20 |
| 21 |
=
| 8 |
| 9 |
| 20 |
| 21 |
=
| 14 |
| 15 |
(6)1
| 1 |
| 2 |
| 5 |
| 8 |
| 25 |
| 28 |
| 3 |
| 10 |
=1
| 1 |
| 2 |
| 7 |
| 10 |
| 3 |
| 10 |
=1
| 1 |
| 2 |
| 7 |
| 10 |
| 3 |
| 10 |
=1
| 1 |
| 2 |
=
| 1 |
| 2 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
练习册系列答案
相关题目