题目内容
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[1-(
|
(
|
分析:(1)先算乘法,再算除法,
(2)根据加法的运算定律进行简算,
(3)先算小括号里的加法,再算中括号里的减法,最后算括号外的除法,
(4)先算小括号里的减法,先算括号外的乘法.
(2)根据加法的运算定律进行简算,
(3)先算小括号里的加法,再算中括号里的减法,最后算括号外的除法,
(4)先算小括号里的减法,先算括号外的乘法.
解答:解:(1)
×8÷
,
=
÷
,
=2;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(3)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
;
(4)(
-
)×
,
=
×
,
=
.
| 1 |
| 5 |
| 4 |
| 5 |
=
| 8 |
| 5 |
| 4 |
| 5 |
=2;
(2)
| 1 |
| 5 |
| 2 |
| 7 |
| 4 |
| 5 |
| 5 |
| 7 |
=(
| 1 |
| 5 |
| 4 |
| 5 |
| 2 |
| 7 |
| 5 |
| 7 |
=1+1,
=2;
(3)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 2 |
(4)(
| 5 |
| 6 |
| 2 |
| 3 |
| 9 |
| 10 |
=
| 1 |
| 6 |
| 9 |
| 10 |
=
| 3 |
| 20 |
点评:此题考查了分数四则混合运算的顺序及灵活运用运算定律进行简算.
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