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Data Sufficiency
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题目:
If
x
and
y
are positive integers and
r
is the remainder when
is divided by 10, what is the value of
r
?
(1)
x
= 25
(2)
y
= 1
选项:
答案:
B
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为什么不知道x的情况下也能求余呢? 请老师解答~
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老师,我听了录音说3的幂个位在3,9,7,1间循环,但此题是要一个确定的解,所以我觉得如果没有x的值,余数还是不能定。
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