题目内容
(2010?南开区)用简便方法计算.
11-
|
(
|
|
分析:(1)运用减法的运算定律进行简算,
(2)运用乘法的分配律进行简算,
(3)把除以
化成乘以
,再运用乘法的分配律进行简算.
(2)运用乘法的分配律进行简算,
(3)把除以
| 9 |
| 7 |
| 7 |
| 9 |
解答:解:(1)11-
-
,
=11-(
+
),
=11-1,
=10;
(2)(
+
)×12,
=
×12+
×12,
=9+4,
=13;
(3)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
| 5 |
| 12 |
| 7 |
| 12 |
=11-(
| 5 |
| 12 |
| 7 |
| 12 |
=11-1,
=10;
(2)(
| 3 |
| 4 |
| 1 |
| 3 |
=
| 3 |
| 4 |
| 1 |
| 3 |
=9+4,
=13;
(3)
| 2 |
| 9 |
| 4 |
| 13 |
| 4 |
| 13 |
| 9 |
| 7 |
=
| 2 |
| 9 |
| 4 |
| 13 |
| 4 |
| 13 |
| 7 |
| 9 |
=(
| 2 |
| 9 |
| 7 |
| 9 |
| 4 |
| 13 |
=1×
| 4 |
| 13 |
=
| 4 |
| 13 |
点评:此题考查了分数四则混合运算的顺序,灵活运用运算定律进行简算即可.
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