题目内容
(1)(
+
)×8+
(2)
÷[1÷(
-
)]
(3)
+
+
+
+
+
+
.
5 |
8 |
1 |
27 |
19 |
27 |
(2)
1 |
6 |
3 |
5 |
3 |
10 |
(3)
1 |
2 |
1 |
6 |
1 |
12 |
1 |
20 |
1 |
30 |
1 |
42 |
1 |
56 |
分析:(1)利用乘法分配律进行计算较简便;
(2)直接运用分数的四则混合运算进行计算即可;
(3)可利用改写分数的计算方法进行计算即可得到答案.
(2)直接运用分数的四则混合运算进行计算即可;
(3)可利用改写分数的计算方法进行计算即可得到答案.
解答:解:(1)(
+
)×8+
=
×8+
×8+
,
=5+
+
,
=5+1,
=6;
(2)
÷[1÷(
-
)]
=
÷[1÷
],
=
÷
,
=
;
(3)
+
+
+
+
+
+
=1-
+
-
+
-
+
-
+
-
+
-
+
-
,
=1-
,
=
.
5 |
8 |
1 |
27 |
19 |
27 |
=
5 |
8 |
1 |
27 |
19 |
27 |
=5+
8 |
27 |
19 |
27 |
=5+1,
=6;
(2)
1 |
6 |
3 |
5 |
3 |
10 |
=
1 |
6 |
3 |
10 |
=
1 |
6 |
10 |
3 |
=
1 |
20 |
(3)
1 |
2 |
1 |
6 |
1 |
12 |
1 |
20 |
1 |
30 |
1 |
42 |
1 |
56 |
=1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
1 |
6 |
1 |
7 |
1 |
7 |
1 |
8 |
=1-
1 |
8 |
=
7 |
8 |
点评:此题主要考查的是分数的四则混合运算及其简便运算.
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