题目内容
脱式计算.
|
|
1-(
| ||||||||||||||||
|
|
1-
|
分析:(1)(2)(4)先通分,在计算;
(3)先算括号内的,再算括号外的;
(5)运用加法交换律与结合律简算;
(6)先通分,运用加法结合律简算.
(3)先算括号内的,再算括号外的;
(5)运用加法交换律与结合律简算;
(6)先通分,运用加法结合律简算.
解答:解:(1)
+
+
=
+
+
=
;
(2)
-
-
=
-
-
=
;
(3)1-(
+
)
=1-
=
;
(4)
-
+
=
-
+
=
;
(5)
+
-
=(
-
)+
=
+
=
+
=
;
(6)1-
-
=1-
-
=1-(
+
)
=1-
=
.
| 1 |
| 2 |
| 3 |
| 5 |
| 7 |
| 10 |
=
| 5 |
| 10 |
| 6 |
| 10 |
| 7 |
| 10 |
=
| 9 |
| 5 |
(2)
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 8 |
=
| 18 |
| 24 |
| 8 |
| 24 |
| 3 |
| 24 |
=
| 7 |
| 24 |
(3)1-(
| 1 |
| 2 |
| 1 |
| 3 |
=1-
| 5 |
| 6 |
=
| 1 |
| 6 |
(4)
| 7 |
| 9 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 14 |
| 18 |
| 12 |
| 18 |
| 15 |
| 18 |
=
| 17 |
| 18 |
(5)
| 19 |
| 20 |
| 1 |
| 5 |
| 9 |
| 20 |
=(
| 19 |
| 20 |
| 9 |
| 20 |
| 1 |
| 5 |
=
| 1 |
| 2 |
| 1 |
| 5 |
=
| 5 |
| 10 |
| 2 |
| 10 |
=
| 7 |
| 10 |
(6)1-
| 1 |
| 14 |
| 3 |
| 7 |
=1-
| 1 |
| 14 |
| 6 |
| 14 |
=1-(
| 1 |
| 14 |
| 6 |
| 14 |
=1-
| 1 |
| 2 |
=
| 1 |
| 2 |
点评:此题考查了分数的四则混合运算,注意运算顺序和通分计算,同时运用运算定律简算.
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