题目内容
怎样算简便就怎样算
|
|
24×
|
分析:(1)把除法转化为乘法,运用乘法分配律简算;
(2)先算小括号内的,再算中括号内的,最后算括号外的;
(3)约分计算;
(4)根据数字特点,运用乘法分配律简算.
(2)先算小括号内的,再算中括号内的,最后算括号外的;
(3)约分计算;
(4)根据数字特点,运用乘法分配律简算.
解答:解:(1)
×
+
÷6,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=
×4,
=
;
(3)24×
×
=10;
(4)(
+
)×24,
=24×
+
×24,
=16+4,
=20.
| 7 |
| 10 |
| 1 |
| 6 |
| 3 |
| 10 |
=
| 7 |
| 10 |
| 1 |
| 6 |
| 3 |
| 10 |
| 1 |
| 6 |
=(
| 7 |
| 10 |
| 3 |
| 10 |
| 1 |
| 6 |
=1×
| 1 |
| 6 |
=
| 1 |
| 6 |
(2)
| 9 |
| 32 |
| 4 |
| 3 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 9 |
| 32 |
| 4 |
| 3 |
| 3 |
| 16 |
=
| 9 |
| 32 |
| 1 |
| 4 |
=
| 9 |
| 32 |
=
| 9 |
| 8 |
(3)24×
| 5 |
| 7 |
| 7 |
| 12 |
(4)(
| 2 |
| 3 |
| 1 |
| 6 |
=24×
| 2 |
| 3 |
| 1 |
| 6 |
=16+4,
=20.
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
练习册系列答案
相关题目