题目内容
(1)
|
(2)
| ||||||||||||||||
(3)
|
(4)
| ||||||||||||||||
(5)
|
(6)〔
|
分析:(1)(2)按照从左到右的顺序计算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先去掉小括号,再算中括号里面的运算,然后算括号外的除法;
(5)先算小括号里面的加法,再算括号外的乘法,最后算括号外的除法;
(6)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法.
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先去掉小括号,再算中括号里面的运算,然后算括号外的除法;
(5)先算小括号里面的加法,再算括号外的乘法,最后算括号外的除法;
(6)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法.
解答:解:(1)
÷
÷
,
=
÷
,
=
;
(2)
÷4×
,
=
×
,
=
;
(3)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
÷[
-(
-
)],
=
÷[
-
+
],
=
÷[0+
],
=
÷
,
=
;
(5)
×(
+
)÷
,
=
×
÷
,
=
÷
,
=
;
(6)[
-(
+
)]÷
,
=[
-
]÷
,
=
÷
,
=
.
| 3 |
| 8 |
| 9 |
| 4 |
| 5 |
| 6 |
=
| 1 |
| 6 |
| 5 |
| 6 |
=
| 1 |
| 5 |
(2)
| 3 |
| 4 |
| 8 |
| 9 |
=
| 3 |
| 16 |
| 8 |
| 9 |
=
| 1 |
| 6 |
(3)
| 4 |
| 15 |
| 9 |
| 5 |
| 11 |
| 15 |
| 5 |
| 9 |
=
| 4 |
| 15 |
| 5 |
| 9 |
| 11 |
| 15 |
| 5 |
| 9 |
=(
| 4 |
| 15 |
| 11 |
| 15 |
| 5 |
| 9 |
=1×
| 5 |
| 9 |
=
| 5 |
| 9 |
(4)
| 5 |
| 8 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 8 |
=
| 5 |
| 3 |
(5)
| 3 |
| 5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 4 |
| 9 |
=
| 3 |
| 5 |
| 5 |
| 6 |
| 4 |
| 9 |
=
| 1 |
| 2 |
| 4 |
| 9 |
=
| 9 |
| 8 |
(6)[
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 12 |
=[
| 5 |
| 6 |
| 3 |
| 6 |
| 5 |
| 12 |
=
| 1 |
| 3 |
| 5 |
| 12 |
=
| 4 |
| 5 |
点评:此题主要考查分数的四则混合运算的运算顺序,以及应用运算定律进行简便计算的能力.
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