For all integers a and b, the operation@is defined as a@b=(-a+b)(b+a). If a=2 an

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问题 For all integers a and b, the operation@is defined as a@b=(-a+b)(b+a). If a=2 and b=5, then b@a=

选项 A、25
B、-21
C、7
D、21
E、25

答案 B

解析 5@2=(-5+2)(2+5)=-21

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