题目内容
计算,能简算的要简算.
-
+
-
+
+
-
-
-
+(
-
)
-(
+
)+
.
| 1 |
| 3 |
| 10 |
| 11 |
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 3 |
| 17 |
| 24 |
| 24 |
| 25 |
| 7 |
| 8 |
| 8 |
| 15 |
| 7 |
| 8 |
| 4 |
| 7 |
| 2 |
| 9 |
| 10 |
| 7 |
| 5 |
| 9 |
| 4 |
| 5 |
| 3 |
| 20 |
| 3 |
| 10 |
| 3 |
| 4 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(3)(4)运用加法交换律与结合律简算.
(2)通分计算.
(5)先算括号内的,然后从左往右依次计算.
(2)通分计算.
(5)先算括号内的,然后从左往右依次计算.
解答:
解:(1)
-
+
=(
+
)-
=1-
=
(2)
-
+
=
-
+
=
(3)
+
-
-
=(
-
)+(
-
)
=
(4)
-
+(
-
)
=(
+
)-(
+
)
=2-
=1
(5)
-(
+
)+
=
-
+
=
| 1 |
| 3 |
| 10 |
| 11 |
| 2 |
| 3 |
=(
| 1 |
| 3 |
| 2 |
| 3 |
| 10 |
| 11 |
=1-
| 10 |
| 11 |
=
| 1 |
| 11 |
(2)
| 3 |
| 4 |
| 1 |
| 3 |
| 17 |
| 24 |
=
| 18 |
| 24 |
| 8 |
| 24 |
| 17 |
| 24 |
=
| 9 |
| 8 |
(3)
| 24 |
| 25 |
| 7 |
| 8 |
| 8 |
| 15 |
| 7 |
| 8 |
=(
| 24 |
| 25 |
| 8 |
| 15 |
| 7 |
| 8 |
| 7 |
| 8 |
=
| 32 |
| 75 |
(4)
| 4 |
| 7 |
| 2 |
| 9 |
| 10 |
| 7 |
| 5 |
| 9 |
=(
| 4 |
| 7 |
| 10 |
| 7 |
| 2 |
| 9 |
| 5 |
| 9 |
=2-
| 7 |
| 9 |
=1
| 2 |
| 9 |
(5)
| 4 |
| 5 |
| 3 |
| 20 |
| 3 |
| 10 |
| 3 |
| 4 |
=
| 4 |
| 5 |
| 9 |
| 20 |
| 3 |
| 4 |
=
| 11 |
| 10 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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