400-600-1123
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文字解析
="font-size: 14px;">Arithmetic Properties of Numbers
1. Given that x = y, then xy could be divisible by x + y (for example, if x = y = 2, then xy = 4 is divisible by x + y = 4) and xy could fail to be divisible by x + y (for example, if x = y = 3, then xy = 9 is not divisible by x + y = 6); NOT sufficient.
2. Given that x = 2, then xy could be divisible by x + y (for example, if x = y = 2, then xy = 4 is divisible by x + y = 4) and xy could fail to be divisible by x + y (for example, if x = 2 and y = 3, then xy = 6 is not divisible by x + y = 5); NOT sufficient.
Taking (1) and (2) together, it follows that x = y = 2, and so xy = 4 is divisible by x + y = 4.
The correct answer is C;
both statements together are sufficient.
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