42+637+...要使这三个数的和为奇数,第三个加数应该是奇数还是偶数,为什么
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42+637+...要使这三个数的和为奇数,第三个加数应该是奇数还是偶数,为什么
42+637+...要使这三个数的和为奇数,第三个加数应该是奇数还是偶数,为什么
42+637+...要使这三个数的和为奇数,第三个加数应该是奇数还是偶数,为什么
奇+奇=偶
偶+偶=偶
奇+偶=奇
42+367=409 为奇数,+第三个数,和为奇数,
所以第三个数为 偶数.
偶+奇=奇
所以第三个加偶数。
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Angel Evolution,tory burch flats, Chapter text / residual volume to make Hong
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