题目内容
用你自己喜欢的方法进行计算.
+
-
+
-
+
+
10-
-
.
| 13 |
| 20 |
| 13 |
| 15 |
| 13 |
| 20 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 2 |
| 3 |
| 10 |
| 5 |
| 17 |
| 7 |
| 10 |
10-
| 8 |
| 17 |
| 9 |
| 17 |
考点:分数的加法和减法
专题:运算顺序及法则
分析:(1)(3)运用加法交换律与结合律简算》
(2)通分计算.
(4)运用减法的性质简算.
(2)通分计算.
(4)运用减法的性质简算.
解答:
解:(1)
+
-
=(
-
)+
=
(2)
+
-
=
+
-
=
(3)
+
+
=(
+
)+
=1+
=1
(4)10-
-
=10-(
+
)
=10-1
=9
| 13 |
| 20 |
| 13 |
| 15 |
| 13 |
| 20 |
=(
| 13 |
| 20 |
| 13 |
| 20 |
| 13 |
| 15 |
=
| 13 |
| 15 |
(2)
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 2 |
=
| 2 |
| 8 |
| 3 |
| 8 |
| 4 |
| 8 |
=
| 1 |
| 8 |
(3)
| 3 |
| 10 |
| 5 |
| 17 |
| 7 |
| 10 |
=(
| 3 |
| 10 |
| 7 |
| 10 |
| 5 |
| 17 |
=1+
| 5 |
| 17 |
=1
| 5 |
| 17 |
(4)10-
| 8 |
| 17 |
| 9 |
| 17 |
=10-(
| 8 |
| 17 |
| 9 |
| 17 |
=10-1
=9
点评:此题考查了分数的四则运算,根据运算定律进行简算.
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