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解析:If a, b, and c are integers, is the

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【单选题】If a, b, and c are integers, is the number 3 (a+b)-c divisible by 3
(1)a+b is divisible by 3.
(2)c is divisible by 3.
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
网考网参考答案:B
网考网解析:

因为3(a+b)-c能否被3整除,只与c能否被3整除有关,所以(1)不充分,而(2)充分。 查看试题解析出处>>

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