题目内容
下面各题怎么简算就怎么算
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1-
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)运用分数的四则混合运算顺序来计算.
(2)运用分数的四则混合运算顺序来计算.
(3)运用加法交换律来简化运算.
(4)运用减法的性质化简原式来简化运算.
(5)运用分数的四则混合运算顺序来计算.
(2)运用分数的四则混合运算顺序来计算.
(3)运用加法交换律来简化运算.
(4)运用减法的性质化简原式来简化运算.
(5)运用分数的四则混合运算顺序来计算.
解答:
解:(1)
-
+
=
-
+
=
(2)
-(
+
)
=
-
=
=
(3)
+(
+
)
=
+
+
=
+
=
+
=
(4)
-(
-
)
=
-
+
=
(5)1-
+
=
+
=
| 3 |
| 4 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 9 |
| 12 |
| 6 |
| 12 |
| 8 |
| 12 |
=
| 11 |
| 12 |
(2)
| 19 |
| 20 |
| 1 |
| 4 |
| 2 |
| 5 |
=
| 19 |
| 20 |
| 13 |
| 20 |
=
| 6 |
| 20 |
=
| 3 |
| 10 |
(3)
| 3 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
=
| 3 |
| 7 |
| 2 |
| 7 |
| 5 |
| 6 |
=
| 5 |
| 7 |
| 5 |
| 6 |
=
| 30 |
| 42 |
| 35 |
| 42 |
=
| 65 |
| 42 |
(4)
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 9 |
=
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 9 |
=
| 2 |
| 9 |
(5)1-
| 3 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 2 |
点评:本题主要考查学生运用分数的四则混合运算顺序及加法交换律来简化运算的能力.
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