题目内容
| 计算 1-
|
(
| ||||||||||||||
1-
|
6÷
| ||||||||||||||
|
2-(
|
分析:(1)先算乘除法,再算减法;
(2)根据乘法分配律简便计算;
(3)先算乘除法,再算减法;
(4)先算乘除法,再算减法;
(5)(6)先算括号里面的,再算括号外面的;
(2)根据乘法分配律简便计算;
(3)先算乘除法,再算减法;
(4)先算乘除法,再算减法;
(5)(6)先算括号里面的,再算括号外面的;
解答:解:(1)1-
÷
×
,
=1-
×
×
,
=1-
,
=
;
(2)(
-
×
)÷
,
=[
×(1-
)]÷
,
=[
×
]÷
,
=
÷
,
=
;
(3)1-
÷
,
=1-
,
=
;
(4)6÷
+
×
,
=7+
,
=7
;
(5)
÷(
+
)×
,
=
÷
×
,
=
×
×
,
=
;
(6)2-(
+
),
=2-
,
=1
.
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 16 |
=1-
| 8 |
| 9 |
| 6 |
| 5 |
| 3 |
| 16 |
=1-
| 1 |
| 5 |
=
| 4 |
| 5 |
(2)(
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 2 |
=[
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 2 |
=[
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 2 |
=
| 1 |
| 8 |
| 3 |
| 2 |
=
| 1 |
| 12 |
(3)1-
| 5 |
| 14 |
| 5 |
| 7 |
=1-
| 1 |
| 2 |
=
| 1 |
| 2 |
(4)6÷
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 6 |
=7+
| 1 |
| 7 |
=7
| 1 |
| 7 |
(5)
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
| 4 |
| 5 |
=
| 1 |
| 4 |
| 7 |
| 6 |
| 4 |
| 5 |
=
| 1 |
| 4 |
| 6 |
| 7 |
| 4 |
| 5 |
=
| 6 |
| 35 |
(6)2-(
| 1 |
| 5 |
| 1 |
| 3 |
=2-
| 8 |
| 15 |
=1
| 7 |
| 15 |
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