题目内容
计算(能简算的要简算)
|
[1-(
|
2-
|
|
分析:(1)先算小括号里的加法,再算括号外的减法,
(2)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,
(3)先算除法,再运用减法的运算定律进行简算,
(4)把除法化成乘法,再运用乘法的分配律进行简算.
(2)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,
(3)先算除法,再运用减法的运算定律进行简算,
(4)把除法化成乘法,再运用乘法的分配律进行简算.
解答:解:(1)
-(
+
),
=
-
,
=
;
(2)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
;
(3)2-
÷
-
,
=2-
-
,
=2-(
+
),
=2-1,
=1;
(4)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 34 |
| 13 |
| 4 |
| 15 |
| 2 |
| 5 |
=
| 34 |
| 13 |
| 2 |
| 3 |
=
| 76 |
| 39 |
(2)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 2 |
(3)2-
| 3 |
| 8 |
| 7 |
| 16 |
| 1 |
| 7 |
=2-
| 6 |
| 7 |
| 1 |
| 7 |
=2-(
| 6 |
| 7 |
| 1 |
| 7 |
=2-1,
=1;
(4)
| 2 |
| 3 |
| 8 |
| 5 |
| 1 |
| 3 |
| 5 |
| 8 |
=
| 2 |
| 3 |
| 8 |
| 5 |
| 1 |
| 3 |
| 8 |
| 5 |
=(
| 2 |
| 3 |
| 1 |
| 3 |
| 8 |
| 5 |
=1×
| 8 |
| 5 |
=
| 8 |
| 5 |
点评:考查了分数四则混合运算的四则,注意灵活运用运算定律进行简算.
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