题目内容
计算下面各题
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1
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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)利用加法交换律简算;
(2)利用加法结合律简算;
(3)先算括号里面的,再算括号外面的;
(4)利用减法的性质简算;
(5)通分计算;
(6)利用加法交换律与结合律简算.
(2)利用加法结合律简算;
(3)先算括号里面的,再算括号外面的;
(4)利用减法的性质简算;
(5)通分计算;
(6)利用加法交换律与结合律简算.
解答:
解:(1)
+
+
=
+
+
=
;
(2)
+
+
=
+
=
;
(3)
-(
-
)
=
-
=
;
(4)1
-
-
=1
-(
+
)
=
-1
=
;
(5)
-
-
=
-
-
=
;
(6)
+
+
+
=(
+
)+(
+
)
=1+1
=2.
| 4 |
| 9 |
| 1 |
| 10 |
| 5 |
| 9 |
=
| 4 |
| 9 |
| 5 |
| 9 |
| 1 |
| 10 |
=
1
|
(2)
| 1 |
| 5 |
| 7 |
| 15 |
| 4 |
| 15 |
=
| 3 |
| 15 |
| 11 |
| 15 |
=
| 14 |
| 15 |
(3)
| 7 |
| 10 |
| 3 |
| 4 |
| 2 |
| 5 |
=
| 14 |
| 20 |
| 7 |
| 20 |
=
| 7 |
| 20 |
(4)1
| 3 |
| 7 |
| 5 |
| 12 |
| 7 |
| 12 |
=1
| 3 |
| 7 |
| 5 |
| 12 |
| 7 |
| 12 |
=
1
|
=
| 3 |
| 7 |
(5)
| 23 |
| 24 |
| 1 |
| 6 |
| 3 |
| 8 |
=
| 23 |
| 24 |
| 4 |
| 24 |
| 9 |
| 24 |
=
| 5 |
| 12 |
(6)
| 1 |
| 12 |
| 3 |
| 8 |
| 11 |
| 12 |
| 5 |
| 8 |
=(
| 1 |
| 12 |
| 11 |
| 12 |
| 3 |
| 8 |
| 5 |
| 8 |
=1+1
=2.
点评:此题考查了分数四则混合运算,注意抓住数的特点灵活运用运算定律进行简算.
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