If the sum r+s is 2 less than the difference r-s, then s =?A、-2B、-1C、0D、1E、2

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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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