题目内容
递等式计算(能简算的要简算)
+
+
+
-
-(
+
)
11-
-
-(
-
)
| 1 |
| 8 |
| 2 |
| 15 |
| 7 |
| 8 |
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 3 |
| 11 |
| 12 |
| 1 |
| 6 |
| 1 |
| 8 |
11-
| 7 |
| 10 |
| 3 |
| 10 |
| 7 |
| 12 |
| 3 |
| 4 |
| 1 |
| 2 |
考点:分数的加法和减法
专题:运算顺序及法则
分析:(1)根据加法交换律进行计算;
(2)先通分,再计算;
(3)先算括号里的加法,再算括号外面的减法;
(4)根据减法的性质进行计算;
(5)先算括号里的减法,再算括号外面的减法.
(2)先通分,再计算;
(3)先算括号里的加法,再算括号外面的减法;
(4)根据减法的性质进行计算;
(5)先算括号里的减法,再算括号外面的减法.
解答:
解:(1)
+
+
=
+
+
=1+
=1
;
(2)
+
-
=
+
-
=
;
(3)
-(
+
)
=
-
=
;
(4)11-
-
=11-(
+
)
=11-1
=10;
(5)
-(
-
)
=
-
=
.
| 1 |
| 8 |
| 2 |
| 15 |
| 7 |
| 8 |
=
| 1 |
| 8 |
| 7 |
| 8 |
| 2 |
| 15 |
=1+
| 2 |
| 15 |
=1
| 2 |
| 15 |
(2)
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 3 |
=
| 20 |
| 24 |
| 18 |
| 24 |
| 8 |
| 24 |
=
| 5 |
| 4 |
(3)
| 11 |
| 12 |
| 1 |
| 6 |
| 1 |
| 8 |
=
| 11 |
| 12 |
| 7 |
| 24 |
=
| 5 |
| 8 |
(4)11-
| 7 |
| 10 |
| 3 |
| 10 |
=11-(
| 7 |
| 10 |
| 3 |
| 10 |
=11-1
=10;
(5)
| 7 |
| 12 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 7 |
| 12 |
| 1 |
| 4 |
=
| 1 |
| 3 |
点评:本题主要考查了学生分数四则运算的计算能力.
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