题目内容
|
| ||||||||||||
|
1÷[
|
分析:(1)先把
÷6×
,写成
×
×
,再约分计算即可解答;
(2)先把
÷
,写成
×
,再利用乘法的分配律的逆运算简便计算即可解答;
(3)根据运算顺序,先算括号里面的即可解答;
(4)根据a-b-c=a-(b+c)的运算性质,先算出
+
,再按照运算顺序计算即可解答.
| 3 |
| 4 |
| 8 |
| 9 |
| 3 |
| 4 |
| 1 |
| 6 |
| 8 |
| 9 |
(2)先把
| 5 |
| 8 |
| 11 |
| 5 |
| 5 |
| 8 |
| 5 |
| 11 |
(3)根据运算顺序,先算括号里面的即可解答;
(4)根据a-b-c=a-(b+c)的运算性质,先算出
| 3 |
| 7 |
| 4 |
| 7 |
解答:解:(1)
÷6×
,
=
×
×
,
=
;
(2)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)
×(
+
),
=
×
,
=
;
(4)1÷[
-
-
],
=1÷[
-(
+
)],
=1÷[
-1],
=1÷
,
=1×
,
=
.
| 3 |
| 4 |
| 8 |
| 9 |
=
| 3 |
| 4 |
| 1 |
| 6 |
| 8 |
| 9 |
=
| 1 |
| 9 |
(2)
| 3 |
| 8 |
| 5 |
| 11 |
| 5 |
| 8 |
| 11 |
| 5 |
=
| 3 |
| 8 |
| 5 |
| 11 |
| 5 |
| 8 |
| 5 |
| 11 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(3)
| 3 |
| 5 |
| 1 |
| 2 |
| 1 |
| 3 |
=
| 3 |
| 5 |
| 5 |
| 6 |
=
| 1 |
| 2 |
(4)1÷[
| 11 |
| 6 |
| 3 |
| 7 |
| 4 |
| 7 |
=1÷[
| 11 |
| 6 |
| 3 |
| 7 |
| 4 |
| 7 |
=1÷[
| 11 |
| 6 |
=1÷
| 5 |
| 6 |
=1×
| 6 |
| 5 |
=
| 6 |
| 5 |
点评:此题主要考查分数乘法的计算法则以及运算定律的灵活应用.
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