题目内容
(2012?安岳县模拟)一件商品,先提价
,再降价
,原价比现价高( )
| 1 |
| 5 |
| 1 |
| 5 |
分析:将原价当作单位“1”,则先提价
后的价格是原价的1+
,再降价
后的价格是降价前的1-
,即是原价的(1+
)×(1-
)=
,则现价比原价低1-
=
,则原价比现价高
÷
=
.
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 24 |
| 25 |
| 24 |
| 25 |
| 1 |
| 25 |
| 1 |
| 25 |
| 24 |
| 25 |
| 1 |
| 24 |
解答:解:(1+
)×(1-
)
=
×
,
=
.
(1-
)÷
=
÷
,
=
.
答:原价比现价高
.
故选:D.
| 1 |
| 5 |
| 1 |
| 5 |
=
| 6 |
| 5 |
| 4 |
| 5 |
=
| 24 |
| 25 |
(1-
| 24 |
| 25 |
| 24 |
| 25 |
=
| 1 |
| 25 |
| 24 |
| 25 |
=
| 1 |
| 24 |
答:原价比现价高
| 1 |
| 24 |
故选:D.
点评:完成本题要注意单位“1”的确定,单位“1”一般处于“比、是、占”的后边.
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