题目内容
用自己喜欢的方法计算.
(
|
|
| ||||||||||||||||
3-1
|
|
[4-(
|
分析:(1)根据乘法分配律进行计算,
(2)把32分解成4×8,再根据乘法交换律和乘法结合律进行计算,
(3)根据乘法分配律进行计算,
(4)根据减法的性质进行计算,
(5)先化成乘法,再进行计算,
(6)先算小括号里面的,再算中括号里的,最后算乘法.
(2)把32分解成4×8,再根据乘法交换律和乘法结合律进行计算,
(3)根据乘法分配律进行计算,
(4)根据减法的性质进行计算,
(5)先化成乘法,再进行计算,
(6)先算小括号里面的,再算中括号里的,最后算乘法.
解答:解:(1)(
-
)×36,
=
×36,
=20;
(2)
×32×
,
=
×4×8×
,
=(
×4)×(8×
),
=3×5,
=15.
(3)
×
-
×
,
=
×(
-
),
=
×
,
=
;
(4)3-1
-
,
=3-(1
+
),
=3-2,
=1;
(5)
÷
÷
,
=
×
×
,
=
;
(6)[4-(
-
)]×
,
=[4-
]×
,
=
×
,
=
.
| 5 |
| 6 |
| 5 |
| 18 |
=
| 10 |
| 18 |
=20;
(2)
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
=(
| 3 |
| 4 |
| 5 |
| 8 |
=3×5,
=15.
(3)
| 9 |
| 20 |
| 3 |
| 7 |
| 9 |
| 20 |
| 1 |
| 7 |
=
| 9 |
| 20 |
| 3 |
| 7 |
| 1 |
| 7 |
=
| 9 |
| 20 |
| 2 |
| 7 |
=
| 9 |
| 70 |
(4)3-1
| 5 |
| 11 |
| 6 |
| 11 |
=3-(1
| 5 |
| 11 |
| 6 |
| 11 |
=3-2,
=1;
(5)
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 3 |
| 2 |
| 6 |
| 5 |
=
| 3 |
| 2 |
(6)[4-(
| 3 |
| 4 |
| 3 |
| 8 |
| 4 |
| 29 |
=[4-
| 3 |
| 8 |
| 4 |
| 29 |
=
| 29 |
| 8 |
| 4 |
| 29 |
=
| 1 |
| 2 |
点评:本题主要考查了学生分数四则运算的计算能力,注意要细心.
练习册系列答案
相关题目