题目内容
计算下面各题.
(1)
| (2)
| (3)
| ||||||||||||||||||||
(4)
| (5)
| (6)
|
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)(5)按照从左到右顺序计算解答,
(2)按照先算括号里面的,再算括号外面的顺序计算解答,
(3)运用减法性质解答.
(4)运用加法交换律和结合律解答,
(6)运用加法交换律解答.
(2)按照先算括号里面的,再算括号外面的顺序计算解答,
(3)运用减法性质解答.
(4)运用加法交换律和结合律解答,
(6)运用加法交换律解答.
解答:
解:(1)
+
+
=1
+
=2;
(2)
-(
-
)
=
-
=
;
(3)
-
-
=
-(
+
)
=
-
=
;
(4)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(5)
+
+
=
+
=1
;
(6)
+
-
=
-
+
=
+
=1.
5 |
12 |
3 |
4 |
5 |
6 |
=1
1 |
6 |
5 |
6 |
=2;
(2)
1 |
2 |
3 |
4 |
3 |
8 |
=
1 |
2 |
3 |
8 |
=
1 |
8 |
(3)
7 |
10 |
3 |
8 |
1 |
8 |
=
7 |
10 |
3 |
8 |
1 |
8 |
=
7 |
10 |
1 |
2 |
=
1 |
5 |
(4)
1 |
6 |
5 |
7 |
5 |
6 |
2 |
7 |
=(
1 |
6 |
5 |
6 |
5 |
7 |
2 |
7 |
=1+1
=2;
(5)
5 |
13 |
5 |
13 |
5 |
13 |
=
10 |
13 |
5 |
13 |
=1
2 |
13 |
(6)
7 |
9 |
2 |
3 |
4 |
9 |
=
7 |
9 |
4 |
9 |
2 |
3 |
=
1 |
3 |
2 |
3 |
=1.
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题.
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