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Data Sufficiency
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题目:
What is the remainder when the positive integer
x
is divided by 8?
(1) When
x
is divided by 12, the remainder is 5.
(2) When
x
is divided by 18, the remainder is 11.
选项:
答案:
E
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@徐小梅老师,为什么这题不能选C用余数通项去求呢?求余数通项是在什么题型下使用呢?
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1
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5025
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这道题我的做法是先根据题意1和2条件分别列出x=12a+5以及x=18b+11然后我求通项公式让这两个等式相等以及12和18的最小公倍数得出通项公式为x=36a+29后面不知道怎么做了求老师告知谢谢
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x=12a+5=18b+11 所以,3b=2a-1,然后该怎么解?
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还是没有思路的题,求解。
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