题目内容
某商店有一批布,第一天卖出
,第二天卖出第一天剩下的
,第三天补进第二天剩下的
,这时有布698米,问原来有布多少米?
| 2 |
| 9 |
| 1 |
| 7 |
| 1 |
| 2 |
1-
-(1-
)×
+[1-
-(1-
)×
]×
=
-
×
+(
-
×
)×
,
=
-
+(
-
)×
,
=
+
,
=1.
即此时布料与原来相等为698米.
答:原来有布698米.
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 7 |
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 7 |
| 1 |
| 2 |
=
| 7 |
| 9 |
| 7 |
| 9 |
| 1 |
| 7 |
| 7 |
| 9 |
| 7 |
| 9 |
| 1 |
| 7 |
| 1 |
| 2 |
=
| 7 |
| 9 |
| 1 |
| 9 |
| 7 |
| 9 |
| 1 |
| 9 |
| 1 |
| 2 |
=
| 6 |
| 9 |
| 3 |
| 9 |
=1.
即此时布料与原来相等为698米.
答:原来有布698米.
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