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纠错
The integers s and t are divisible by 5. Which of the following is NOT necessarily true?
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A.s-t is divisible by 5.
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B.s+t is divisible by 10.
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C. st is divisible by 25.
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D.s^{2}-t^{2} is divisible by 5.
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E.s^{2}+t^{2} is divisible by 25.
B显示答案
