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题目内容
Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy?
(1) She bought $4.40 worth of stamps.
(2) She bought an equal number of $0.15 stamps and $0.29 stamps.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
答案:A
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问题:请问徐老师:这是一种特殊的方程个数小于未知数个数但是却有唯一解的,在此想问一个共性问题:这种情况有什么规律呢?我如何判断一个两个未知数的方程只有唯一解,去了有取整数条件的限制,还有看个位数05,还有什么其他的规律吗?
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问题:为什么不选D呢?条件(2)的话设两种邮票各买了x个,则有:0.15x+0.29x=4.4,解得x=10啊。
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问题:老师 为什么c不成立 还是没有听懂 为什么a单独就可以解出来
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问题:C不行么?
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