题目内容
计算
-
÷
+
(
+
)×
+
-
+
-
+
2014×
.
| 9 |
| 8 |
| 1 |
| 12 |
| 2 |
| 3 |
| 5 |
| 12 |
(
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
2014×
| 2012 |
| 2013 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照先算除法,再从左到右顺序解答,
(2)运用乘法分配律,以及加法结合律解答,
(3)化
=
+
,
=
+
,
=
+
,
=
+
,再运用加法交换律以及结合律解答.
(4)运用乘法分配律解答.
(2)运用乘法分配律,以及加法结合律解答,
(3)化
| 7 |
| 12 |
| 1 |
| 3 |
| 1 |
| 4 |
| 9 |
| 20 |
| 1 |
| 4 |
| 1 |
| 5 |
| 11 |
| 30 |
| 1 |
| 5 |
| 1 |
| 6 |
| 13 |
| 42 |
| 1 |
| 6 |
| 1 |
| 7 |
(4)运用乘法分配律解答.
解答:
解:(1)
-
÷
+
=
-
+
=1+
=1
;
(2)(
+
)×
+
=
×
+
×
+
=
+(
+
)
=
+1
=1
;
(3)
-
+
-
+
=
-(
+
)+(
+
)-(
+
)+(
+
)
=
-
+(
-
)+(
-
)+(
-
)+
=
+
=
;
(4)2014×
=2013×
+1×
=2012+
=2012
.
| 9 |
| 8 |
| 1 |
| 12 |
| 2 |
| 3 |
| 5 |
| 12 |
=
| 9 |
| 8 |
| 1 |
| 8 |
| 5 |
| 12 |
=1+
| 5 |
| 12 |
=1
| 5 |
| 12 |
(2)(
| 24 |
| 19 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 24 |
| 19 |
| 1 |
| 8 |
| 16 |
| 17 |
| 1 |
| 8 |
| 15 |
| 17 |
=
| 3 |
| 19 |
| 2 |
| 17 |
| 15 |
| 17 |
=
| 3 |
| 19 |
=1
| 3 |
| 19 |
(3)
| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
=
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=
| 1 |
| 2 |
| 1 |
| 7 |
=
| 9 |
| 14 |
(4)2014×
| 2012 |
| 2013 |
=2013×
| 2012 |
| 2013 |
| 2012 |
| 2013 |
=2012+
| 2012 |
| 2013 |
=2012
| 2012 |
| 2013 |
点评:(1)以及四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题,是本题考查知识点.
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