GWD数学题，请教。

bobiouou

16
From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30?

(1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504

(2) During this period of time, the increase in the balance in the checking account was 8 percent.

INE>INE>

我选c但是答案是A，我百思不得其解。

Does the decimal equivalent of P/Q, where P and Q are positive integers, contain only a finite number of nonzero digits?

(1) P>Q

(2) Q=8

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

AnswerE

今天怎么了，尽碰到数学问题。我选B，

observer

16

From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30?

(1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504

(2) During this period of time, the increase in the balance in the checking account was 8 percent.

INE>INE>

我选c但是答案是A，我百思不得其解。

条件(1)the balance in the account on May 30 would have been $504 不就是要求的the balance in the checking account on May 30吗?,所以条件(1)是充分的

条件(2)因为不知道the balance in the checking account on May 1,所以无法得到the balance in the checking account on May 30,所以条件(2)不是充分的

Does the decimal equivalent of P/Q, where P and Q are positive integers, contain only a finite number of nonzero digits?

(1) P>Q

(2) Q=8

INE>INE>我的理解是不是求P/Q小数点后有确定的位数,那1/8小数点后有3位,2/8小数点后有2位,4/8后小数点有1位,所以条件(2)不是充分.

l Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient

l Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient

l BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

l EACH statement ALONE is sufficient

l Statements (1) and (2) TOGETHER are NOT sufficient

AnswerE

今天怎么了，尽碰到数学问题。我选B，