题目内容
计算下列各题,能简便的要简算: 33-
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分析:(1)依据减法的性质解答,
(2)(3)(4)按照分数四则运算顺序解答,
(5)(6)运用加法交换律以及加法结合律解答.
(2)(3)(4)按照分数四则运算顺序解答,
(5)(6)运用加法交换律以及加法结合律解答.
解答:解:(1)33-
-
,
=33-(
+
),
=33-1,
=32;
(2)
-
+
,
=
+
,
=
;
(3)
+(
-
),
=
+
,
=
;
(4)
+
-
,
=
-
,
=
;
(5)
-
+
,
=(
+
)-
,
=1-
,
=
;
(6)
-
-
+
,
=(
-
)+(
-
),
=1-0,
=1.
7 |
9 |
2 |
9 |
=33-(
7 |
9 |
2 |
9 |
=33-1,
=32;
(2)
13 |
25 |
13 |
50 |
1 |
5 |
=
13 |
50 |
1 |
5 |
=
23 |
50 |
(3)
1 |
2 |
2 |
3 |
1 |
4 |
=
1 |
2 |
1 |
12 |
=
7 |
12 |
(4)
1 |
2 |
4 |
5 |
5 |
6 |
=
13 |
10 |
5 |
6 |
=
7 |
15 |
(5)
5 |
8 |
2 |
3 |
3 |
8 |
=(
5 |
8 |
3 |
8 |
2 |
3 |
=1-
2 |
3 |
=
1 |
3 |
(6)
19 |
14 |
1 |
4 |
5 |
14 |
1 |
4 |
=(
19 |
14 |
5 |
14 |
1 |
4 |
1 |
4 |
=1-0,
=1.
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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