题目内容
用喜欢的方法计算.
(1)
+
-
(2)1
-
-
(3)
+
+
+
.
(1)
| 1 |
| 9 |
| 5 |
| 6 |
| 1 |
| 3 |
(2)1
| 5 |
| 12 |
| 3 |
| 4 |
| 1 |
| 4 |
(3)
| 8 |
| 11 |
| 4 |
| 9 |
| 5 |
| 9 |
| 3 |
| 11 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)先通分,再计算;
(2)利用减法的性质简算;
(3)利用加法交换律与结合律简算;
(2)利用减法的性质简算;
(3)利用加法交换律与结合律简算;
解答:
解:(1)
+
-
=
+
-
=
;
(2)1
-
-
=1
-(
+
)
=1
-1
=
;
(3)
+
+
+
=(
+
)+(
+
)
=1+1
=2.
| 1 |
| 9 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 2 |
| 18 |
| 15 |
| 18 |
| 6 |
| 18 |
=
| 11 |
| 18 |
(2)1
| 5 |
| 12 |
| 3 |
| 4 |
| 1 |
| 4 |
=1
| 5 |
| 12 |
| 3 |
| 4 |
| 1 |
| 4 |
=1
| 5 |
| 12 |
=
| 5 |
| 12 |
(3)
| 8 |
| 11 |
| 4 |
| 9 |
| 5 |
| 9 |
| 3 |
| 11 |
=(
| 8 |
| 11 |
| 3 |
| 11 |
| 4 |
| 9 |
| 5 |
| 9 |
=1+1
=2.
点评:掌握分数加减混合运算的运算顺序和运算方法以及利用运算定律简算是关键.
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