2. 外语
  3. If the sum r+s is 2 less than the difference r-s, then s =?

If the sum r+s is 2 less than the difference r-s, then s =?

admin2009-05-19  42
问题 If the sum r+s is 2 less than the difference r-s, then s =?
选项 A、-2
B、-1
C、0
D、1
E、2
答案B
解析 若r+s的值比r-s的值小2，则s=?
解：本题的正确答案为(B)。由题意可得：r+s=r-s-2→s=-1
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